Mics are for singing, not whacking dudes in the face? Check the replies for a video of Adam from Taking Back Sunday getting into it with a guy at the Glasgow, Scotland show.
I saw TBS twice (Slam Dunk North in Leeds and this show in Glasgow) in May and they were atrocious. Adam Lazzara was awful. The Glasgow show he was considerably worse and took two songs walking round the whole venue whilst the band still played. His vocal performances at these shows was nothing short of dismal. I'd have been raging if I was in that band.
Reading the comments on that youtube page explain in more detail. What an awkward, awkward moment ... can't tell wtf he was doing all over the guy to start with.
Adam climbs on dude, tries to undress him (from video comments), gets pushed away, guy in red tries to help push him off/keep him away from his friend (from video/comment) - Adam whacks him in face with mic - guy in red decks Adam in face. Security grab kid in red.