If you clicked on this article, you’re probably either fully aware of Caspar Lee’s YouTube channel (you might even be one of his four million subscribers) or you’ll have absolutely no clue who the devil this South African chappy is.

Either way, today is Caspar’s 21st birthday and there’s no time like the present to discover (or re-discover) the audacious fella’s best pranks.

We’ve rounded up five of his most hilarious pranks for your viewing pleasure.

1. Girlfriend pranks my roommate

Cheeky chappy Caspar might be a hoot to watch, but we wouldn’t fancy house-sharing with him any time soon. In this video, which has amassed a stonking seven million views, he hired an actress to pretend to be his girlfriend and secretly films what happens when she hits on fellow YouTube star (and also Zoella’s brother) Joe Sugg. Watch the cringeworthy situation unfold before your very eyes.

Roommate shower prank

He covers poor Joe’s towel in red food colouring, makes his shower run cold, puts green food dye in his showerhead and left a stinkbomb in there to  - all while secretly filming on covert cameras. Before you feel too sorry for him, you might want to watch Joe’s shower prank, where he covers an unsupecting Caspar in flour.

3. Breaking up with my roommate

Poor Joe doesn’t just get lambasted in the shower or propositioned by fake girlfriends – in this video Caspar pretends he’s moving to America and won’t be living with Mr Sugg any more. It’s somewhere between absolutely hilarious and heartbreaking because Joe genuinely looks quite saddened by the news.

4. Crush on my roommate’s sister

How exactly do you break it to your roommate that you’re secretly in love with his sister? Over the phone, while filming it for a YouTube video apparently.

Joe isn’t the only victim of Caspar’s pranks – his family are also often the subjects of his cunning jokes. In this video, he manages to convince his mum that he has been arrested for urinating in public. Poor mummy Smart.

5. I got a girl pregnant

This horrible prank makes Joe’s shower surprises and fake girlfriend propositions look tame. Watch Caspar Lee convince his mother that he has got a girl pregnant. She takes it surprisingly well, which possibly makes the whole thing even worse.

If you’re wondering why on earth anyone would want to be friends with this guy, watch this video of him telling total strangers (of both genders, he’s not a total creep) that they’re beautiful. N’aww.