Yes, it's that time again, folks! Welcome to our toe-curling, stomach-churning, jaw-dropping collection of September's biggest fails - courtesy of the dedicated YouTube-trawlers at TNL.
And what can we learn from this month's offering? Well, on no account should you ever get on a jet-ski. Or a bicycle. Or a swing. Just say no to the obvious ones like skateboarding, free-running and dangling off fire escapes. Don't attempt a headstand on the stairs. Don't try to drive a car that's fixed to the ground by a rock.
Oh, and if you really must blow up an empty building, make sure you do it properly. Otherwise, you just end up looking a bit silly.
Right, got all that? Too scared to ever leave home again? Very wise! Stay where you are and take a look at our slideshow of previous fails compilations...
More:Fail September's Biggest Youtube Fails Biggest Fails Uk Viral Videos September's Biggest Fails
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