Analagous to their malevolent movie counterparts, the modern-day Gremlin is most often found on weekends in between the hours of 1800 and 0400. When in its passive form, the Gremlin is most often a well-intentioned and meaningful contributor to society. However, when provoked (usually by means of an ex-girlfriend or obnoxious fool at the bar), the Gremlin first becomes forlorn and introspective, then mischevious, and in some cases violent.
If you encounter a fully manifested Gremlin, you are advised to stay clear (especially when the Gremlin is in a doorway). If you feel the need to intervene, it has been said a trip to Burger King can passify the creature.
The Gremlin will return to its natural state by morning, usually feeling embarassed and apologetic.
"Ryan and Pat went so Gremlin last night. They painted Blaine's car!"
"If you don't call me back I am going to go Gremlin."