Justin Bieber: The Bigger They Are ... The Harder They Fall

Justin Bieber disappeared onstage Thursday night after falling through a trap door, and it's pretty dramatic.

The Biebs was performing at the SaskTel Centre in Saskatoon, Canada when he traversed the stage and was swallowed up.

Check out both videos ... he got back on his feet and he seems ok, but this was a top 10 for 2016.