That reminds me of last years TPC. In one of TheDamian's sessions (I think it was 'The Conway Channel') he was talking about how he wrote Inline::Files. At this point Ingy stood up at the back of the hall and shouted something to the effect of "Excuse me, who wrote Inline::Files?". TheDamian made some form of 'off-the-cuff' remark and Ingy stormed out of the session. All harmless fun (I think...) and rather amusing :-)
You missed the best part then: this was just a set-up. Damian and Brian spent the whole week pretending they had had an argument, just to prepare the last lightning talk, were Damian started explaining how he created Inline::Files, just for Brian to step in and argue that _he_ was the creator, and they spent 5 minutes yelling at each other... in Shakespearian English! That was really funny.