According to Justin Bieber's twitter feed, "Milk was a bad choice!" During last night's kickoff to his Believe tour in Glendale, AZ, Bieber stopped mid-performance during his song "Out of Town Girl" and began to throw up on stage. (There's a reason those front row seats are expensive. Great photo op!).
After cleaning himself up he returned to the stage and asked if the crowd was still willing to love him despite the incident which he later attributed to first night nerves and an overabundance of milk pre-show.
If you have a weak stomach I'd recommend avoiding the video.