Here's a top tip! If you've got any old game cartridges knocking around and you don't know what to do with them, why not make them into fridge magnets? I recently purchased an Atari 2600 with a load of games and unfortunatley two of them (Pitfall and River Raid) didn't work despite my best attempts at cleaning the connectors with alcohol etc. It seemed a bit of a shame to just chuck them in the bin so I purchased some adhesive magnetic tape stuck it to the back of the carts and vuala! Two retro fridge magnets!
Try it yourself, all you need is a broken game cartridge and some adhesive magnetic tape. I got a whole metre of the stuff for just £1.60 off eBay.