You know you're procrastinating when you're starting to listen to dancy music and start dancing and singing to it.
"Super Trouper" by Abba comes up - person starts singing: Suuuuuper Trooouuupeerrr liiight are gonna bliiind me, buuuut I woon't feel bluuuuuuuuuue!
Mother hears person singing: Oh man, she's procrastinating again...