Hot Archaeopteryx
When you're having sex with a girl from behind and you jizz on her back then coat her with dodo feathers, under a minimum of 3 furlongs of lithified sediment.
THEN YOU DON'T CALL HER BACK!
THEN YOU DON'T CALL HER BACK!
The Hot Archaeopteryx is a good trick. Problem is you can only do it once.