It was mandatory for RAF Bulldog crews to wear parachutes for all flights. During a real aircraft abandonment after a UAS QFI couldn't recover from a high rotational spin, he ordered his student to "Jump, jump, jump!"
The student forgot to jettison the canopy iaw the emergency drills and instead opened it by sliding it back, as for a normal egress. After he jumped the aircraft promptly came out of the spin. The QFI watched him land in a field then flew back to base!