Not my worst ever flight but makes me chuckle....
Flying happily across the wilds of Scotland last week in my trusty C172, applying regular carb heat as you do when the conditions prevail.
Went to apply the carb heat again a few mins later and the knob & pushrod came off in my hand !!
Not scary or anything but the confused look on my face must have been a picture !!
Decided a prompt return to land would be a wise move after that before the coughing and spluttering commenced.
Similar thing happened to me with a car gearstick once......
Is someone trying to tell me something ??