New internet meme alert! There have been some chuckle-inducing one-liners floating around the web lately, many of which start with "If you watch it backwards ..." What we're witnessing is truly historic: the birth of a new genre of joke. The world's reservoir of "Your mom is so ..." jokes has nearly run dry, so it didn't happen a moment too soon. Already a Tumblr site has cropped up to collect the best of them -- which is where this slightly bad-taste rib-tickler came from:

One of my favorites thus far is this: If you watch 127 hours backwards its a lovely film about a disabled man finding an arm in the desert.

But not all Watch it Backwards jokes are about movies. For instance:

Heck, they don't even have to be about TV. Here's one I rather like about college:

But the movie jokes always seem to be the best:

• If you watch The Exorcist backwards it’s about a girl who’s very sick until she eats some pea soup and finally gets better.

• If you watch Die Hard backwards, it’s about a bunch of terrorists helping to repair a sky scraper just in time for a Christmas party.

• If you watch Rambo backwards, it’s about Sylvester Stallone healing people with his magical bullet vacuum.

Got any you'd like to share?