Two simultaneous incidents one after the other:
Three green not illuminating when raising the Landing gear in an Arrow. Then a completely different Arrow the very next day, the left main gear didn't want to "lock" in place, so landed 2 green lights. Exciting seeing fire trucks await your arrival. Luckily nothing collapsed. Shut down and evacuated on the runway.
Other than that, expecting and preparing for any other problems to arise in the future. It will happen, and to the safest of pilots.
Retractable aircraft don't like me too much!
Regards,
s744