I distinctly recall cheering on old Newegg when a patent troll accidentally sued them. Newegg said they would be taking the issue to court, and actually prevented the patent troll from backing out of the suit, IIRC.
It's worth noting that that's not at all what Newegg claims happened.[0] So "accidentally" in this case is probably more accurately states as biting off more than one can chew.
[0]: https://www.newegg.com/insider/patent-trolls-learn-mess-newe...
But, maybe somebody messed up and didn't check who was on the other end of the suit.
I think the poster meant "accidentally targeted someone who would not only fight back, but also hurt the patent troll", not "accidentally filed a suit".