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
Multiplied by a MATRIX
of negative I comma zero...
The Big Bang Theory Season 5, Episode 7
the calculation
of nuclear MATRIX elements.
The Big Bang Theory Season 7, Episode 20
You can see the MATRIX, can't you?
The Big Bang Theory Season 1, Episode 12
...he said that Johnny Depp
was in The Matrix.
The Big Bang Theory Season 6, Episode 6