Sometimes when I interview people for a technical position, I throw a couple of acronyms at them to see if they can expand them and even better, explain them. I've been challenged on the validity of this as a "filtering" technique to catch out the bullshitters; I'm convinced it's a good way of checking on someone's level of [claimed] knowledge. It can let you see how long they've been in the game -- and at what level they sat in the nerd stack -- if you throw something old at them like SNMP or UUCP. You can also see how current they are with trends with ones like SOA, LINQ or TDD.
I think the funniest answer I got was for SCSI: "System Can't See It."