Proudest bug squash experience?

Fixed a N+1 pattern bug on our web site. Wasn't a deeply technical problem, but I was proud to shove the fix up the arse of the developer who blamed me (and even got a VP involved) for the web site crashes (the N+1 involved his code calling a service I wrote) and none of the half-dozen other devs found it.
I really wanted to make a t-shirt with his initial 'blame' email outlining all the 'technical problems' with my service, and the fix was literally moving the service call outside 5 (yes 5) level deep for..each loops.