A security guard working at Say Anything's concert in West Hollywood on Monday night (22Dec14) received an unpleasant surprise when band frontman Max Bemis threw up on him.

Singer Bemis was closing out the group's set at the House of Blues when he vomited without warning.

It's not clear why the rocker threw up, but he obviously felt better immediately and continued performing.

Video of the mid-song vomit went viral early on Tuesday (23Dec14).