It spits out several mouthfuls of chicken feathers.

I feed the mimic my leftover halloween lollipops.

They fuse in the stomach of the mimic, and then it spits them back out as a lollipop warrior that sears its loyalty to you.

I feed the mimic a packet of twisties.

The mimic spits out a Kaladesh dragon, which sears you. 

I feed the mimic an Amonkhet giant crab. 

It spits a copy of Time Streams, because you just BROKE THE BARRIER BETWEEN THE PLANES!

I feed the mimic its child.

The mimic explodes violently, releasing every object previously eaten. The baby mimic eats the previously eaten objects, growing to full size and doing a celebratory dance.

I feed the mimic a disco ball.

The mimic spits out a brightly-lit dance floor, followed by the lollipop warrior now inexplicably wearing a neon polyester suit and platform boots. The mimic then begins belting out songs from Saturday Night Fever. It's a surprisingly good singer, and you can't help but be caught up in the beat. However, your clumsy attempts to join in annoy the mimic so much that it swallows you whole and grumbles something about 'kids these days'.

The lollipop warrior feeds the mimic the platform boots it was wearing.

The mimic puts the boots on its head, extremely confused about how to use them. 

I feed the mimic a vial of super gro potion, a warlock, and the memories i have of the twilight series that need to be gone forever, along with every last copy of the twilight books and movies.

The mimic swirls the things around in its mouth for a moment and then spits out the entire twilight universe that is connected to ours by a portal behind the mimic.

I feed the mimic the planet express crew.

The mimic recoils in disgust and confusion and spits out a ticking box. 

While everyone else runs and hides, I feed the mimic the packaging from my new clock. 

The mimic recycles the packaging and thanks you for helping save the planet. You receive a nice warm feeling in your tummy.

I feed the mimic a lifetime supply of ******.

It goes in the other room for 23 minutes and comes back looking releaved. And gives you a sparkely vampier and a wooken stake.

I give the mimic a orca wale. You dont want too know how i got an orca here.

The mimic and the orca consider each other for several minutes. The mimic then opens its mouth as wide as possible and somehow, after a lot of choking and gasping, manages to swallow the orca whole. Some hours later, looking rather ill, the mimic coughs out several gallons of salt water and quite a lot of small fish. The whole room now smells like a fish market gone wrong.

I feed the mimic a bottle of strong cologne. Just for good measure, I also spray some about the room (the smell really is that bad).

The mimic barfs at the smell and the barf floods the room.

I feed the mimic a pb&j sandwich

fixed.

As you may have noticed, this thread doesn't get a lot of updates anymore. There are a few of us trying to keep it alive, but be prepared to wait a long time between comments.

The mimic chuckles in a childlike way and tears into the sandwich. After a few moments, however, it's chewing slows down and then halts altogether. The mimic's teeth appear to be stuck together from the sticky peanut butter. The mimic grumbles out something, possibly "help me," but it is too garbled to make out. Until someone unsticks the mimic's teeth the game has come to a grinding halt. The game has now become Free the Mimic.

I try to unstick the mimic's teeth with a bar of soap.

The mimic thinks you're trying to wash its mouth out with soap, so it knocks the soap out of your hand with a pseudopod. 

I take the easy way out because obviously magic can solve all your problems.  Prestidigitation to remove the mess. 

The mimic is free and gives you some cornbread as thanks.

I feed the mimic a spellbook that i totaly did not pickpocket from another forum member.....

The mimic looks through the spellbook, finding a warlock spell that requires a human sacrifice. Not knowing what a human or a sacrafice is, it uses itself as the main ingedient, killing itself while summoning a Demon mimic. The game has become Feed The Demonic Mimic. Said demonic mimic spits out a few he'll fire balls for ambiance.

I feed the Demon Mimican unholy text of demonic origins.

Quote from DRAGY55555 >>

The mimic is free and gives you some cornbread as thanks.

I feed the mimic a spellbook that i totaly did not pickpocket from another forum member.....

The mimic thanks you for returning its diary, and gives you 87 flaming gold coins, and its autograph.

I give the demon mimic dvds of the show full house. Every season of it.