Good god, is there video of this anywhere? On the NJ date, when blink was having the crowd give it up for the other bands, he was jokingly singing na na na, but i need to see if he did jump out and do it during mcr's set.
Oh, I think I should have worded that better. By "jump into", I mean he just started singing after one of the blink songs. Probably the same thing he did in NJ, I'm guessing.