Many moons ago whilst heavily engaged in CHTR ops in PD, I had to change aircraft rather quickly - it was ALREADY loaded and ready to go - and the resident 'filthy' pilot who ALWAYS left the aircraft dirty / messy / and 'crap' everywhere, had actually filled her up - AND wiped the windscreen for me............WOW!!
I actually bought him a beer when I got back later.
He still didn't really change though.....Only bloke I've ever seen start an aircraft facing the runway, brakes orf, and just 'go for it'....