"I had never heard of Y-Fronts, so I wrote it off and scrolled right past. But they kept coming…"
I got there from here: "A data company turns an unusual branding issue into a case study: does its logo looks like a pair of men’s underpants?"
ADDED: What's worse making your logo accidentally look like men's underpants? Making it accidentally look like the contents of men's underpants. I first blogged that link back in 2005, when we laughed until we cried.