Unlikeliest shootdowns?

I wasn’t sure wether this should be in Historic or Modern but as the posts will invariably include modern aircraft I chose here.

What is the unlikeliest combat shootdown?

By that I mean for example a Hercules shooting down a MIG29 but not any of the hundereds of bombers in WW2 shooting down fighters as that was included in the aircrafts design spec.

A wild but highly unlikely possibility is something along the lines of a B2, F117 etc shooting down anything!