You turn and see...

[MyLittlePonyTales]

[Dunder]

Give her a hug and invite her to dinner.

[RarityDash]

Probably be quite freaked out at first. Once I adjusted however, I'd probably just smile and hug her while being slightly disappointed it wasn't her sister there instead.

[kamerad]

AHHH

AHHH

wat

AHHH

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[Bronynumber299]

AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Will you be my bestest friend?Then huggles!

[SirShadowdeath]

Fall off of my office chair. Who wouldn't be a tad scared?

Then I'd eventually realize what's happening and wonder how to get her out of my office and through the streets of NYC to...my apartment? Anywhere?

Or, I'd have no idea what to say and start an awkward conversation!

[flutterscotch]

I'd lay off the sauce?

[Kirby Krackle]

"I'm married."

[TortoiseShell]

I'd ask to brush her hair or her coat or something. Luna is best pony.

[Talex]

first I would make an audible gasp, then squee, then I would hug her, and then try to figure out how to explain that the princess of the night is in my room to my parents.... Then I would get distracted by her cuteness and admire her more. I think that's about it. ^^

[tacobob]

Give her one of those cookie cakes!

[ONWARDconwardicus]

Step 1: Fall backwards out of my chair in a comedic fashion

Step 2: Ask "Are you Luna?"

Step 3: Ask: "How did you get here? is there a way for you to get back?"

Step 4: Take the way back.

[MyLittlePonyTales]

Give her one of those cookie cakes!

Pretty sure that's a Moon Pie.

[KingChrysalis]

Hugs and hugs and hugs and hugs

Also, we need more "What Do?" threads on Canterlot.

FTW

[Starfox64x]

Everything...

Or just squee and hug her...