Big Bang Theory Quote
Howard: I was trying to come up with something really romantic to give Bernadette for Valentine's Day, since she's been such a pain in the ass.
Leonard: Can't find a card that says that?
Howard: Check it out; I used the atomic force microscope in the materials science lab and wrote our initials in a heart one one-thousandth the size of a grain of sand.
Leonard: Oh-hoho, that's cool.
Howard: A micro-valentine for a microbiologist.
Leonard: From her micro-husband.
Quote from S06E16 - The Tangible Affection Proof