Doctor Who :D

its a Christmas tree surrounded by three guys crying and a guy behind it laughing

The face of an octopus and the snout of a pig, all in one.

red brain matter

A picture of a "brain" - a sort of modified heart, only with a mind, or brain.

Smile. Your brain loves you.

guy shows his brain and advises you to smile

the joker confused at his friend's offers for brains

Sick of fisticuffs Batman instead offers the Joker a piece of his mind