Great oppurtunity to post some "so there I was..." stories on the net. Always fun to read :-)
Here's one that happened to me on 2 occasions as a newbie instructor, with a newbie student: Student makes first OK landing semi-assisted) a few lessons into the private course. Tower instructs student to "turn left when able, contact ground on 120.45". Apparently the student hears "Turn left IMMEDIATELY on the taxiway you are just passing, contact ground on 120.45". Student practically slams on left brake, nano-seconds after touching down. The subsequent near total loss of directional control comes quickly, and sure gave me some heart pounding seconds. Fortunetly the day is saved without incident and student gets a little ground on proper braking technique :-)
Not so scary, more annoying- had a student once turn the radios off as we were flying inbound to KFLL for touch n' go's. Apparently found it hard to hear me over all the ATC chatter. Little more ground work when back on the ground on Class C operations :-)