You've seen this one before haven't you. Come on, be honest!

Clear any level with disappearing arrows modifier.

Give the patient heterochromia.

Complete a brain transplant by throwing it in.

...and it was going so well.

Answer the phone.

Perform a heart transplant.

Use Mind Wave for the first time.

Kill 100 Red Dudes with an Uzi.

Cut a few bullets in a row using a bladed weapon.

Listen to the surgeon rap.

Kill 100 Red Dudes with a pistol.