From memory the Hawk stude noticed that the canopy was partially open after take-off and decided that the rocket assisted arm chair was the solution to seeing daylight under the canopy rail.
I am pretty sure that the tale that the emergency services discovering the gibbering lady owner of the property into which the Hawk had removed a large section of bathroom wall, whilst said lass was astride the crapper, is just an urban myth
Looked pretty whizzin around the circuit as I taxyed back though
Oh and lets just say it one more time - the FC did not pull the handle OK
The seat just sorta went off, all by its self