Hawaii Five-0, Season 5

[Odell is frantically making a molotov cocktail to deter the gunman]

Steve:
So you're a barber, you're a lawyer, and you're an explosives expert?

Odell:
Yeah, my Grandpa Jack was a barber stationed in England during World War II. Uncle Sam liked the boys cleaned up before heading to the front lines. He was assigned to the Combat Demolition Unit. One of his regulars taught him how to make a Molotov Cocktail using hair dye and aftershave. Jack always said, "A piece of knowledge is better than a good tip."

Steve:
Good thing you were paying attention, huh?

Odell:
There we go. Done. [to Steve, seriously] I'm a pacifist.