
I haven't seen him this stuck since he
tried to figure out the third Matrix movie.
The Big Bang Theory Season 3, Episode 14

You can see the MATRIX, can't you?
The Big Bang Theory Season 1, Episode 12

I'm in the MATRIX, Leonard;
I see everything.
The Big Bang Theory Season 5, Episode 10

He recommended that I go see
the third Matrix movie...
The Big Bang Theory Season 4, Episode 7