Simple. the user above you has put an object in a vending machine. You say what comes ut, and then put something in

Example: Poster=Epicface

Epicface: I put in a frog

User1: Out comes salad!
I put in a dollar bill

User2: Out comes OVER 9000! coins lying at mach 6 ripping through your organs.
I put in a rubber duck

Ok, i will start. I put in a coin :)

 

i get a music disc

I insert notch's head

 

You get a computer

I insert a free resident coin :]

 

0ut comes a finnish guy holding a hockey stick looking proud on a dog with a knights leg eating a puck with a sword through its head

i insert an epic face

 

you win a

i insert a

 

you get blueberry pie :D

I insert a cookie

OMG COOKIEZ NOM NOM NOM NOM COOKIEZ SPAMZ BOTZ LOLZ FAILZ COOKIEZ!

 

out comes D0rc

I insert andrewkm :]

(keep this trend going)

 

Out comes a zanderman999 :]

I insert mission001