Novelty/silly SMALL gift ideas for a guy?

Ok, so I had this thought. I have one of those advent calendars where you have 24 pockets and you can put something in for each day. I thought it'd be good fun to fill it up with things for my boyfriend for advent. (Yeah, ok some of you will think it's a little lame, but hey, it's a bit of silly fun and I think he'll enjoy it.) Only problem is there are 24 pockets and I've no idea what to put in them! I'm thinking I'll get a range of stuff to keep it interesting (plus I don't have a lot of money)-so some will just have like, chocolates in but I want some of them to be more interesting lol. I don't want to spend too much but I don't mind getting a few things that are a little more pricey if they're good ideas. It can be stupid things or useful things...but they have to be small because the pockets are only little. Any helpful suggestions?? (My boyf is in his 20s if that helps lol) X