Creaming a girl to celebrate that she is 25 years, 1 month and 18 days old, which is exactly 8 times pi.

Must be performed by a nerd.

The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.