Sheldon, they haven't done anything wrong.
I think it's NICE they're hitting it off.
The Big Bang Theory Season 10, Episode 1
(CHUCKLES) Nice try, I'm not going.
The Big Bang Theory Season 10, Episode 21
SHELDON:
Nice to meet you, Professor Proton.
The Big Bang Theory Season 6, Episode 22
Oh. Hello.
Nice to meet you.
The Big Bang Theory Season 12, Episode 14
Oh, it's really NICE
to meet you, too.
The Big Bang Theory Season 12, Episode 13