Here's a funny one: you know how kids these days ask each other to homecoming, prom, etc., by doing something 'surprising' ... signs along the road, popping out of boxes, whatever?
My son got asked to homecoming by his girlfriend this way: she got into our house while he was at school and cleaned his room! He came home and didn't know what was up until he went into his bathroom and saw the signs, ballons, etc.