The idea behind fiverr is pretty simple: People post activities they're willing to perform for five dollars, and if anyone feels like paying them to do it, they can go right ahead.
There seems to be a decent filtering system in place, because 90% of the posts seem legit (e.g. "I will write a short story for you", "I will make a custom blog theme for you". "I will draw a picture of you" etc), but luckily for me, there are still plenty of insane people and sick freaks posting stuff too.
Here are a few of the strangest pledges I've come across so far.