Do you have a 'Go To' Adventure? Something in a genre or vein you could run in almost any situation or for particular game types at the drop of a hat? Something comfortable and familiar you can use to get a game going or just fill in a gap?
If so, what is it?
For me I have two, one for modern/futuristic games and one for more fantasy/historical settings.
For modern/futuristic I like doing a group of criminals/bad guys taking over a mall or shopping center. You get hostages, but also interesting public locales that give lots of options to the players while making for a tense situation and some fun action sequences.
For historical games, cultists grabbing a family works great for low level characters while being an easy one shot, or setting up a future adventure chain.
What about you? Any tricks or go to easy plot elements you keep handy just in case?