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

The newly hatched CUCKOO
eats all the food...
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

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

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