Edit: I changed it to "I accidentally deleted a bad game revision from MAME" for now - is that accurate enough?
'Unexpectedly' would be a little more accurate I think. Or just 'That time I deleted a game from MAME'.
Or “I found a bad dump in MAME and corrected it”
What about "Adventures in MAME ROM dumping and games preservation"? It's the one that might stand the test of time to be useful for posterity.
'Unexpectedly' would be a little more accurate I think. Or just 'That time I deleted a game from MAME'.