
I thought it ended at CUCKOO.
The Big Bang Theory Season 1, Episode 15

By that standard,
Penny is CUCKOO for Cocoa Puffs.
The Big Bang Theory Season 4, Episode 9

Oh, yeah. The Mr. Spock CUCKOO clock.
The Big Bang Theory Season 10, Episode 10

It's like the world's
fattest CUCKOO clock.
The Big Bang Theory Season 7, Episode 23

was for CUCKOO pills.
The Big Bang Theory Season 7, Episode 7