I've seen the argument that beer should be poured into a wet glass - they claim it reduces tension at the side of the glass and helps head retention.I ordered a beer at a bbq joint last week and the waitress asked if i wanted a cold glass with it (it was a bottle of skull splitter) i said a room temp glass would be preferable. She came back with my beer and a glass that was dripping wet. She told me they didn't have any that weren't chilled so she held this one under hot water for a bit to warm it up. Kinda funny i thought, but she was doing what she could to complete my order.
Not sure if I believe it or not, but could maybe be plausible.