I had an extremely scary expereince once on a KLM flight from Schiphol (Amsterdam) to UK.
Relatively small aircraft, it was the KLM Cityhopper service, and the aircraft was a Fokker F-70.
Taxi-ing down the runway giving it some welly, at almost takeoff speed, there was an almighty series of "jolts" the aircraft veered violently to the right, pilot managed to ditch it back down and abort the takeoff, mind you we stopped on the grass!!
The Stench outside the plane was overpowering.
They then sent emergency vechicles, followed by busses, to retrieve all of us, and take us back to the terminal building.
Once another aircraft was sought, and we were all loaded back on, the (same) captain, announced that the brakes on the right hand side of the undercarriage had seized on the previous aircraft, hence the aborted takeoff etc.
All we could think was thank goodness we hadn't actually taken off - because landing with an undercarriage like that would have had VERY interesting consequences!
Interestly, I also recently had a simelar (but much less severe) situation and aborted takeoff at Edinburgh.
I wouldn't have liked to have been the peron responsible for checking that undercarriage, prior to takeoff..!