I once witnissed a stag-do on a Dash8 flight that got into heavy turbulences...

Roughest ride I experienced to date - imagine at least 8 cups of beer flying back and forth through the cabin, emptying themselves over the passenger's heads, at least 3 (sober) people throwing up and the distinct feeling that the wing is streched a little too far and will break apart any second...

The only time that I felt like I could kiss the ground when we finally touched down...