I remember hearing an advertisement for a program to help English speakers learn Spanish. It was some sort of audio tape thing. The advertisement was on the radio. The catch phrase at the end was: "Have you ever wondered how to spell 'socks' in Spanish? ... Eso sí, ¿qué es?" That last part in Spanish sounds like you're spelling out S-O-C-K-S.
I remember that something clicked after I learning that the Spanish word for socks is los calcetines. I asked my teacher about it because that would be spelled c-a-l-c.... She chuckled and told me about the pun. I think it was a pretty clever marketing ploy that you wouldn't understand unless you didn't need the product in the first place.