It's Darth Vader SHAMPOO.
The Big Bang Theory Season 1, Episode 1
...and my new dandruff SHAMPOO
doesn't smell like tar.
The Big Bang Theory Season 6, Episode 6
Mouthwash, lotion, body wash,
SHAMPOO and conditioner...
The Big Bang Theory Season 2, Episode 21
Only to SHAMPOO
Professor Shamburg's shih tzu.
The Big Bang Theory Season 3, Episode 14
And if they have
any of those tiny bottles of SHAMPOO?
The Big Bang Theory Season 10, Episode 13