They refuse to look at the silver lining.
By looking over your shoulder!
They went looking for love in Alderaan places.
He hates camping
Werewolf: Search me!
A monster with an all-over perm.
How many pessimists does it take to change a light bulb? None - it's probably screwed it too tight anyhow!
An Optimist learns German. A Pessimist learns Chinese. A Realist learns AK-47.
Because not every cloud has a silver lining