Eminem

Mmm, Here’s the official explanation as to why Eminem's performance at last weekend's T In The Park festival in Scotland was delayed for 40 minutes... laser pens.
Police were reportedly searching for a group of people who were pointing the illegal lasers at the stage.
Eminem was held from going on stage until the lasers were found.
An insider told a national newspaper that “Eminem was desperate to go on stage but he was held back for his own safety... “Police and security staff are instructed to clamp down heavily on people who arrive with malicious intent.”