...but that's the natural REACTION
of the limbic system...
The Big Bang Theory Season 3, Episode 11
...or drinking coffee while driving
reduces one's REACTION time...
The Big Bang Theory Season 2, Episode 5
For every action,
you have a gigantic and annoying REACTION.
The Big Bang Theory Season 10, Episode 18
Look at her REACTION
to the good-night kiss.
The Big Bang Theory Season 2, Episode 1
in which I looked up
the REACTION rates
The Big Bang Theory Season 7, Episode 6