...REGARDING polymer degradation
phenomenon...
The Big Bang Theory Season 3, Episode 14
"REGARDING your quantum guidance system,
provisional patent 62/295118."
The Big Bang Theory Season 9, Episode 24
...REGARDING the check-engine light
to be very troubling.
The Big Bang Theory Season 2, Episode 5
...REGARDING you and Leonard
crossed some sort of line.
The Big Bang Theory Season 2, Episode 9
[SINGING]
And also REGARDING the bat
The Big Bang Theory Season 8, Episode 21