"Turbulence!"
Line Training on the VC 10.
Awaiting our onward steed in Sri Lanka 1978 it was announced that it needed a heavy turbulence check which involved shipping a cherry picker by sea from India. After 3 days the aircraft was manoeuvred up to the terminal and engines used a ladder to inspect the tailplane. Whilst the accident report ( left several pax in hospital including a broken back) the true story was a fellow copilot u/t decided to route around a rocket cloud when the captain took over control and flew straight through it to show what a macho man he was.