At Chicago 2006 ATRR tour, there were all kinds of problems with the sound, and Richard's bazouki feed didn't work until halfway through DWB. MK kept apologizing. When they couldn't get Richard's sound, MK decided to start the song anyway.
Also, Salt Lake 2005, MK messed up the words on TR. He forgot the words for a second on the "used to like to go to work, but they shut it all down" verse. But he covered it up so well, most people didn't notice. It's my favorite song, so I did notice.
The next day, I got to meet much of the band in Las Vegas. I was talking with Glenn Worf about it, and he said he was quite surprised MK forgot the words, and he said MK was really mad at himself after the concert. Glenn and I then began talking about it being surprising MK doesn't make more mistakes as he's doing sometimes complicated lyrics with impressive guitar playing. Glenn sounded like he's quite an MK fan. Glenn was extremely nice and talked to me for about 5 minutes.