On my 84, a passenger managed to get the sunroof switch jammed in the "close" position. It would let out a squack about every 3 or 4 minutes until I found the source of the problem.
2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg
And remember folks, Only You Can Prevent Hilliary.