Here is the most comprehensive list of almost all Cortana easter eggs. The list was first compiled by Windows Central Forums User MeWhoElse & increased with inputs from other users. Hope you like them :).
What’s the best phone operating system? / What’s the best phone?
What’s the best operating system?
Who is your father? / Who’s your Daddy?
What’s your favourite music? / What’s your favourite song?
What’s the best tablet?
What’s the best computer?
Sing me a song?
How old are you?
Tell me a joke?
Where are you from? / Where do you live?
Do you have a boyfriend?
Are you pretty? / Are you sexy?
What should I call you?
What’s the best search engine?
What are you?
Who made you?
What do you look like?
Who are you?
Do you like Satya Nadella?
Do you like Steve Ballmer?
Do you like Bill Gates?
What do you think of Apple?
Do you like Google?
Will you marry me?
I’m bored.
You’re cool.
What’s the best computer?
Who made you?
Tell me a story.
I’m really drunk.
Knock, knock.
What is Halo?
Beam me up Scotty.
What are you wearing?
Where is the Master Chief?
Am I pretty?
I love you.
What’s your name?
Can I change your name?
What is the meaning of life?
Do you love me?
Where do you live?
You are so intelligent.
Do you know Siri?
Do you know Google Now?
Do you like Siri?
F*** you.
Bit**.
What’s the story of the next Halo game?
Are you pretty?
Are you smart?
Where is your home?
I’m confused.
You’re funny.
Use the Force.
Do you like Android?
Open the pod bay doors.
What’s the answer to the universe?
What are you doing?
How are you doing?
Are you human?
What does the fox say?
I thought you were dead! / Didn’t you die?
What is rampancy? / Tell me about rampancy.
Tell me about Dr. Halsey.
Tell me about [anything to do with Halo]
Are you Cortana from Halo?
Do you love Master Chief?
Kiss me.
Are you hot?
What is love?
Can you dance?
Are you real?
Who is your favourite artist?
I am angry.
Talk to me.
You’re awesome.
What do you eat?
Do you have a baby?
Are you male? / Are you female?
What do you think of Windows?
You suck.
Do you like iOS?
Good Morning.
Goodnight.
Do you like Google Now?
Do you have a mother?
Are you awake?
Can you cook?
That was not the question.
Do you like Clippy? (Ask another (witty reply) question and her “Halo” will turn into Clippy from the older version of Office.)
I hate you.
Why Cortana?
How old are you?
Who are you?
Do you like Microsoft Office?
Who is your boss?
Hello HAL.
Why did the chicken cross the road?
May the Force be with you.
Talk dirty to me.
Who’s your creator?
How do I look today?
Do you have a sister?
Dance.
Who’s better, you or Siri?
I don’t like you.
May I kiss you.
What’s better, Google or Bing?
Siri called you a Bit**
You my Ho.
You’re sexy.
What is the meaning of Cortana?
What do you think of Microsoft?
Cortana!
Hello.
Good afternoon.
Good evening.
Goodbye.
What do you think of Xbox?
Do you love Master Chief?
Are you sleeping?
What are you up to?
Is Lumia the best smartphone?
Are you beautiful?
You are ugly.
You are beautiful.
Am I ugly?
Do you know Jen Taylor?
You are an idi**.
You are a bad girl.
Sorry
I’m stoned.
Testing.
What do you think of me?
I’m stupid.
Do an impression.
Are you in Halo 5?
Say something funny.
Am I beautiful?
Are you boring?
Guess what!
You’re creepy.
You’re so annoying.
Do you like Jimmy Fallon?
Cortana, I’m lonely.
I’m happy.
You’re the best assistant ever.
Thank you.
Can I borrow some money?
What’s your story?
What does Cortana mean?
I’m drunk.
Where do babies come from?
Do you know what Master Chief is doing?
What is Master Chief doing?
I thought you were dead
Didn’t you die?
Where is master chief?
What is rampancy?
Tell me about rampancy
Tell me about Halo 5?
Tell me about Dr. Halsey?
Tell me about Elites
What do you know about Halo 5?
Tell me about Catherine Halsey
What do you know about Dr. Halsey?
What is Elites?
Tell me about Grunts
Are you the Cortana from Halo?
What do you know about Elites
Are you dating Master Chief?
What do you know about Grunts
Tell me about Hunters
Tell me the story of Halo 5?
What is Master Chief up to?
What do you know about Hunters
Are you in love with Master Chief?
Are you really Cortana?
Do you love Master Chief?
What do you know about Jackals
Tell me about Jackals
Who is Catherine Halsey?
Are you the same Cortana from Halo?
What do you know about Hunters
Did you really die?
Tell me about Prophets
Who is Dr. Halsey?
Tell me about Buggers
Tell me about Brutes
Tell me about Prometheans
What is the story of Halo 5?
What do you know about Buggers
Tell me about Crawlers
Tell me about Watchers
Tell me about the Didact
What do you know about the didact
What do you know about Brutes
Tell me about Guilty Spark
Tell me about Knights
Tell me about the Librarian
What do you know about the Librarian
What you know about the flood
What do you know about Guilty Spark
Which is your favorite Halo?
What is your favorite Halo?
What is favorite Halo game?
Which is your favorite Halo game?
Tell me about Halo?
Tell me about beamish
What do you know about Halo?
Tell me about hamish beamish
Why are you blue in color?
Aren’t you dead?
Why are you blue?
Which Halo game do you like the most?
What do you know about beamish
Tell me the story of Halo?
Will you be reborn in Halo 5?
Will you resurrect in Halo 5?
What is Master Chief’s last name?
Will you come back in Halo 5?
Do you Master Chief’s last name?
What is the story of Halo?
What do you know about hamish
What do you know about Hamish Beamish
What do you know about Catherine Halsey?
Are you in Halo 5?
Do you know Jen Taylor?
Source: Windows Central Forums
