
It's a CHILDISH trick designed to confuse
and intrigue simpletons.
The Big Bang Theory Season 4, Episode 18

Guys, you're
being CHILDISH.
The Big Bang Theory Season 7, Episode 16

Don't make it sound CHILDISH.
The Big Bang Theory Season 12, Episode 14

That's a bit Childish, isn't it?
The Big Bang Theory Season 10, Episode 11

- You're being CHILDISH.
- No. He is.
The Big Bang Theory Season 8, Episode 21