Losing my marbles

[pennymachines]

Recent advances in neuroscience imaging show the human brain resembles the inside of a sophisticated mechanical amusement machine.

[badpenny]

............ far too much activity to be my brain ............ and where's the bit that makes me forget somebody's name within three seconds of hearing it?

[john t peterson]

I recognize this brain; it's my ex-wife's! You see her at the bottom right catching all the coins I've put in and dropping them into her stash.