Many important and life-changing things happened this year, but to be perfectly honest, that list of events probably doesn'tinclude any of the following YouTube challenges.

Still, they are pretty hilarious so let's take a walk back down memory lane and relive the weird and wonderful challenges that everyone on YouTube was talking about in 2015.

Kylie Jenner Lip Challenge

A device that can make your lips look at plump as Kylie's without having to go under the knife? Sounded like such a great idea - or at least until the videos of people with bruised faces started popping up all over the internet.

The One Product Beauty Challenge

Sounds mental, but actually looks amazing. Something to keep in mind next time you forget your makeup bag and can only find half a broken lippy in the bottom of your bag.

The No Thumbs Challenge

Because sellotaping your thumbs to your hands so you can't use them makes perfect sense.

Clown Contouring

Even after 15 watchesyou still won't have a clue how on earth she manages to turn that into a normal and blended face of makeup.

The Charlie, Charlie Challenge

*Cue creepy music*

The Don't Judge Challenge

While this one had good intentions, it earns a spot in here because it pretty much misses the point about real beauty, doesn't it?

The FaceTune Challenge

Basically involves people making like Kimmy K and the Kardashians and trying their favourite selfie adjustment app.

Condom on your head Challenge

What started as a demo of why guys who say their penises are too big to fit in condoms are just plain lying turned into a viral internet challenge. Who'd have thought it?

- By Linds Foley.