Old telephony joke. When I was at a (former baby bell now consumed by SBC/ATT), we would like to tell the incoming know-it-alls how lines were classified as either POTS (plain old telephone service) and PANS (pretty amazing new services) and waited to see their "oh, you're just trying to pull my leg" expression.

It was funny when they realized that no, we were not tugging at anyone's lower limbs. It definitely took a bit of wind out of their sails, just like I'd had it taken out of mine when I'd heard it.