Could be a PSA on why you don't f*ck around with the ocean....
So much to learn here.

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The duration of this video has been updated from unknown to 3:59 - length declared by CrushBug.

Well that escalated quickly.

Never turn your back on the sea.

Once you've admired the lovely waves, you can skip forward to about 2:13 for the start of the action...

It's amusing how cruel people can unwittingly be (on YouTube) making fun of the elderly man being sucked into the sea to die and their misplaced vitriol at the disabled person who is unable to help. It's not so much that an old guy almost died and a crippled person couldn't do anything; it's the the irony in the comments due to people not knowing the truth. Then again, maybe it could also be a skit like the disabled fat guy from Little Britain?

Certainly, it is funny, despite the cruelty in laughing at other people's misery. It could be a gag in an Adam Sandler movie, except the old guy would be Bob Barker and he'd be pulled out to sea and heard cursing as he drifts and blinks out in the sunset. *Plink!*

Everyone would laugh and then Adam Sandler would kiss a blond woman, probably Drew Barrymore, while the sun sets and we do the Looney Tunes fade out, with Porky Pig interrupting with a hand gesture, "A bi-di-a-bi-di-a-bi-di-abi-di-that's all folks!"

A tourist here in Iceland died a couple of days ago in an incident like that. He was standing on a beach that is known to have these big waves come that can pull people in but tourists either don't notice the warning signs or ignore them because it doesn't look dangerous. Until the big wave hits, that is.
It's the first death since 2007 but I have heard many news stories about people barely escaping.