You can't put a saddle
on Leonard Hofstadter.
The Big Bang Theory Season 5, Episode 19
No, I can't let
you do that.
The Big Bang Theory Season 5, Episode 1
...I see no reason
why that can't happen to any of you.
The Big Bang Theory Season 6, Episode 18
I'm sorry. I can't do that.
Breaking Bad Season 2, Episode 11
We can't. Not yet.
Game of Thrones Season 5, Episode 6