A very long time ago at LGW sitting on ground with pax onboard due to a tech problem. Engine housing is open and engineer is in fixing/locating problem.
Call bell goes and elderly lady says "I just wanted to let you know dear that there's a pair or legs sticking out of the engine".
Me: "They belong to the engineer he's just sorting out the problem"
Elderly lady: "Well you'd better let him know they're there"
Me: "I'll be sure to let him know!!"