Accidentally applied 12VDC input to the 5VDC output pin...

oric_dan(333):
[oft hand, I'll bet I have everyone else beat by 100,000X or
so, having once burned up a $7M space craft].

Do you mean "burned up" as in "re-entry failure", or as in "fried some circuitry while still on the ground" (which did $7m in damage)?