
Leonard, what if you have
an ALLERGIC reaction...
The Big Bang Theory Season 8, Episode 9

I'm ALLERGIC to peanuts.
The Big Bang Theory Season 1, Episode 16

It has avocado on it.
She's ALLERGIC to avocado.
The Big Bang Theory Season 8, Episode 3

...he's ALLERGIC to Earth nuts,
but I'm the alien.
The Big Bang Theory Season 8, Episode 21

that says "ALLERGIC
to penicillin."
The Big Bang Theory Season 5, Episode 12