Video: Girl catches male flatmate on camera doing something REALLY grim with her toothbrush

Moving in with randoms can be an uncomfortable experience; sometimes it works, sometimes it doesn't! 

But as one woman discovered, there are far worse things that can happen when sharing your space with people you don't know.

The woman, who gave her name only as Sarah, told 9 Honey how she caught her male housemate rubbing his genitals on her toothbrush after becoming suspicious that somebody was going into her room.

Sarah, 28, said her horrifying experience started after she and her boyfriend found another couple looking to house-share on Trade Me.

After a few months living together, she began noticing that things were moving around and suspected the female housemate was coming in to use her beauty products.

"When you find your flatmates blonde hair in your underwear drawer... you've got to ask yourself questions," she said.

Sarah and her boyfriend began putting a shoe behind the door, knowing it would move it the door was opened.

Sure enough, every day the shoe moved from its spot.

Determined to catch the make-up thief, Sarah then bought a webcam and set it up in the corner.

But she wasn't prepared for what she found!

Her male housemate can be seen coming into her room, going into her bathroom, and pulling his trousers down in the corner.

The man then stands there for around 20 seconds without moving, before his hand reaches out and takes a toothbrush from above the sink.

He then moves it over toward his crotch and out of shot, before replacing it moments later and walking out.

Sarah said: "I initially didn't believe my boyfriend when he called me and told me ... why would someone do that? We hadn't done anything wrong...I cried!"

After confronting the man about the footage, she said he admitted to having "a toothbrush obsession" before going bright red.

Well, you don't see that everyday...

Daily Mail