Yes, and I think it's pretty
MATURE of me to admit it.
The Big Bang Theory Season 11, Episode 11
That would be
the MATURE thing to do.
The Big Bang Theory Season 11, Episode 15
That's very MATURE of you.
The Big Bang Theory Season 9, Episode 13
Very MATURE.
You're lucky I'm out of Silly String.
The Big Bang Theory Season 6, Episode 22