Proceedings of the National Academy of Sciences, a prestigious scientific journal with an extremely unfortunate acronym.
Scientist #1: Hey, could I take a look at your PNAS?
Scientist #2: Sure, as long as it's for science. <unzips pants and whips it out>
Scientist #1: GOD NO WHY I meant your Proceedings of the National Academy of Sciences!
Scientist #2: Oh, ok, sorry. Huh, that's the tenth time that's happened this week.