When two guys go in for a punch at the same time and both manage to connect well, you get a double knockout. I suppose, statistically, double knockouts in boxing are bound to occur every so often - if they both deliver a hook with the same hand at the same time, it's going to happen sooner or later.

This video is a compilation of double knockouts, also involving some rather random UFC moments that don't even involve throwing punches.

I feel that this video is rather cruel to the melon-smashing failure we saw earlier this week, but definitely worth posting - for it's not every day that you see a woman who can smash melons with her melons... and I mean, wow, those are some melons.

• Melon vs Melon

More fail today, with this Dutch guy trying to break a record for smashing the most watermelons with his head in 2 minutes. Unfortunately, he gets off to an eye-wateringly bad start!

His initial embarrassment quickly turns to panic as he realises that he must break some watermelons to avoid further humiliation, and so we watch and laugh (and wince) as he repeatedly pummels his skull into melons harder than concrete blocks, through grunts of desperation and pain.

Cracked presents a collection of amazing images that you would expect to have been Photoshopped, but are completely genuine. Some you may have seen before, but they are always fascinating to see again.

• 15 Images You Won't Believe Aren't Photoshopped

The crab scares the living shit out of me, but I particularly like the look of the crazy Japanese pizza which is topped with peas and mini burger patties, plus a 'pigs in blankets' stuffed crust!

You think you've seen the obvious fail when the guy falls off the motorbike, but then there's more...

Ouch (and by that I mean the damage to the camera he was carrying).

Today is Christmas for my family. On the 24th we have a nice dinner and then open presents and generally hang out together until late (as kids, we always had our presents before anyone else). My mum is German/Danish, so this is a tradition she has brought to the family, but we also celebrate Christmas Day in the traditional way. Double whammy.

I wrote this post in advance because I knew I'd be too busy on Christmas Eve, so from everyone here at MTG (uh... me and my laptop), have a great Christmas.

Artificial Christmas Spirit

In case you're feeling a little lonely and happen to be spending Christmas Eve on your computer (or perhaps you're just a nerd) here is some web-based Christmas spirit, to get you in the mood to go and socialise with your friends or family...

• Faux Fire

I only know her as YouTube user ameri1122, but she is an 11-year-old Japanese girl who plays epic songs like a one-man band. Using the most complex-looking keyboard I've ever seen, she plays all the parts at once.

YYZ by Rush

This is amazing! She plays everything - the guitar, bass and keyboard parts. She could duet with Neil Peart and they could just get rid of the rest of Rush.

I had to do some research and find out exactly what sort of keyboard she's playing, and apparently it's a Yamaha Electone ELS-01C. This appears to be some sort of über synthesiser available only in Asia, which has 2 keyboards, a pedalboard, and roughly 6 million buttons.

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Scientists at the Lunar and Planetary Lab of the University of Arizona have created an interactive web page that allows you to calculate the environmental effects an asteroid would cause if it were to collide with Earth.

Simply input certain parameters, such as the projectile size, velocity and impact surface, and the program will estimate the outcome of such an object hitting Earth. This includes the size of the impact crater and resulant fireball, as well as the loudness of the explosion and strength of seismic shaking.

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