I heard this technique does work... but if you want a human moustrap may I suggest
My bf has caught many mice with his.

I wish I had seen this before I spent £15 on a mousetrap yesterday.

The mousetrap that has failed to catch the mouse currently living in my house, I might at.

The mousetrap that is in reality an elaborate mouse restaurant.

I'm going to set something like this up next to the trap and see if it gets a result.

I used to make these traps, and they work quite well. The difference between mine and the one on Amazon is that I used an oil can (when there was such a thing) and suspended it across the top of the bucket with a stiff wire. Smear the can with peanut butter and put the "ramp" about an inch or so away from the can. Mouse smells peanut butter, climbs up ramp, can't quite reach it and jumps onto the can which rotates and dumps the rodent into the water. I caught over 20 mice in one night in a shop I worked at.

I had a mouse running in my room, so my bf bought a mouse trap. He put a piece of chocolate on it and it was killed the next morning. Mice likes chocolate, so put chocolate on the trap.

I've got chocolate in there at the moment. The mouse gets in, eats some of the chocolate and gets out again.

But I've got a bucket set up too...

You mustn't know how to set the trap properly for them to be eating the chocolates and getting away :p

On a standard mouse trap, use peanut butter and wrap some thread around it. The mouse will lick some of the peanut butter.. then grab the thread and tug on it.. bye bye mouse.

The trap is set right but the mouse isn't heavy enough.

But if I keep feeding it chocolate...

Keep feeding it chocolate - I'm sure it'll gain weight soon.