Cleared to take off in a fixed wing trainer, I accelerated onto the runway from the holding point - in a 'punchy student' kind of way - and reached up to close my helmet visor.
Sadly, I had left the velvet cover over it (RAF MK3 Helmet), and as the visor had locked down it wasn't that easy to retract it with one hand. There were a decidedly unhappy few moments as I tried to regain vision by removing the cover
