Seem to have had a few(!)
As a neophyte glider pilot, nobody really discussed the practicalities of long cross country flights, other than to explain that plastic bags were the answer.... (trying not to be graphic here!) Suffice to say my first attempt was conducted at a goodly height. Just as well - mid stream I realised it was all getting quiet - nose high, asi dropping, heaps of yaw; not a good moment for an impromptu spin.. (yes, I avoided one)
As a ppl student taking of for my first ever navex, the door on the 150 popped open as the nosewheel left the ground. Handled calmly, told the instructor I would be ignoring the door until a safe height. Unfortunately the entire plan/plog/chart etc. had been between my left knee and the door.
On another occasion a passenger started screaming at the point the aircraft left the ground - and continued to about 500ft! She did calm down and thoroughly enjoyed the flight, but I've paid a bit more attention to where the intercom off switch is since then