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