It was captured by a fan in the stands
Another fan also captured the video from the end-zone view.
Just a bunch of kids out there having some fun.
Beckham in particular was in a musical mood on Monday, busting out a "Thriller" celebration after scoring a touchdown against the Bengals.
There's no real way to know if Shepard and Lewis were part of the pregame dance party as part of a plan or if it was just an off-the-cuff dance-off, but it sure is delightful to watch.