Movie Rain
A term used to describe a torrential downpour in which you are completely soaked to the skin in under 120 seconds. Derived from the fact that due to the difficulty in getting raindrops to show up on film a simple rain shower always involved far greater amounts of water being dumped on the stars than would otherwise be normal.
'Sweety what happened to your lovely beehive hairdo?' Oh, we got caught in Movie Rain for 3 minutes... so now I look like I am auditioning for a remake of Carrie.