"New Kids on the Block" singer Jonathan Knight says there weren't a lot of on-stage mishaps over the years, but there was one that stood out.  

"There was one show that we had this magic stuff and trap doors and people would disappear through those trap doors. So, one of the trap doors wasn't secured and Donnie [Wahlberg] fell through it and banged his chin—an ambulance came and we were all like, 'Oh my god, he's dead!' So, that was probably the most memorable one," says Jonathan. We're glad Donnie was okay!