"You don't need the brains of an Archbishop/Rocket Scientist......"
"Every landing you walk away from is a good one"
not sure the next one is well used, but was worthy of comment:
" You're supposed to make love to the sky, not shag it!" Brendon O'Mallon (?) of C4s Spitfire Pilot show
"As camp as a row of tents"
"N.F.I...."
"It's/I'm FUBARed"
etc..