I found a very cool list of epic debugging stories [1] (link via Hacker News [2]). These stories are way more epic than my most epic bug [3], like the random memory corruption caused by a bad timing signal [4] or the inability of email to be delivered past 500 miles [5] (my personal favorite story).
[1] https://github.com/danluu/debugging-stories
[2] https://news.ycombinator.com/item?id=10104949
[4] http://www.gamasutra.com/blogs/DaveBaggett/20131031/203788/My_Hardest_Bug_Ever.php