As a student I aborted a takeoff due to a couple of bangs on rotation and
nearly went into the grass. Turned out to be the pax seat belt hanging out
the door. The only things damaged were my ego and my rearend from the
chewing I got from my CFI.

Had something like that happen... my instructor forgot to tell me that
150's sometimes get a violent nosewheel shimmy during the takeoff
roll... well, I found that out for myself on my first solo... pushed
the power up, and a few seconds later the whole plane started
shaking... aborted the takeoff thinking it was going to come apart on
me. Course, he just tells me to keep the weight off the nose, so my
three flights were done soft-field style with the nose up as soon as
it would go.