It's Darth Vader SHAMPOO.
The Big Bang Theory Season 1, Episode 1
for peeing
in his SHAMPOO bottle...
The Big Bang Theory Season 12, Episode 4
...when she discovers your Luke Skywalker
"no more tears" SHAMPOO?
The Big Bang Theory Season 1, Episode 1
Mouthwash, lotion, body wash,
SHAMPOO and conditioner...
The Big Bang Theory Season 2, Episode 21
You've convinced me, maybe we should
sneak in and SHAMPOO her carpet.
The Big Bang Theory Season 1, Episode 2