I always thought
I was more like a CUCKOO bird.
The Big Bang Theory Season 1, Episode 15
Oh, yeah. The Mr. Spock CUCKOO clock.
The Big Bang Theory Season 10, Episode 10
I thought it ended at CUCKOO.
The Big Bang Theory Season 1, Episode 15
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