Justin Bieber Clinging to Moving Van On Skateboard

5/11/2014 6:05 AM PDT BY TMZ STAFF
051114_justin_bieber_launchThere is such a thing as reckless and there is such a thing as stupid ... Justin Bieber riding his skateboard while hanging onto the side of a moving van is the latter.

Biebs -- who of course had a friend film the stunt -- posted the video on his Instagram page on Saturday with the caption, "Ridin down fairfax lol had a great time."

As the old Eminem lyric goes, "How the f*** you supposed to grow up when you weren't raised?"