...or drinking coffee while driving
reduces one's REACTION time...
The Big Bang Theory Season 2, Episode 5
...the success or failure of the date would
be based on the biochemical REACTION...
The Big Bang Theory Season 1, Episode 3
If the two of you engage in intercourse,
this will create the biochemical REACTION...
The Big Bang Theory Season 2, Episode 9
in which I looked up
the REACTION rates
The Big Bang Theory Season 7, Episode 6
For every action,
there's an equal and opposite REACTION.
The Big Bang Theory Season 2, Episode 22