Kind-of related this: I saw a documentary about trainee Mustang pilots. One of them said he was so nervous in his first Mustang flight (after training on planes which seemed like toys in comparison) that he threw up all over the cockpit.
Said he felt completely ashamed when he landed - thinking they'd reject him as a fighter pilot.
The groundcrew man took a quick look, pulled out a damp sponge and said something along the lines of 'Is that all. I've seen much worse than that.'
Nerves and anxiety seem to play havoc with the digestive system.