Want to try smoking some barbecue but don't want to shell out for a meat smoker? You can make a relatively decent smoker with little more than cardboard box. Of course it won't be quite as effective as the real deal, but it's a fun experiment.
In the video, Cook With Meat quickly assembles a DIY meat smoker with a cardboard box to contain the smoke and heat. (The main drawback here — aside from flammability! — is that it will be difficult to get it hot enough to cook the meat, but if nothing else you can use it to add a smokey flavour before you finish the cook elsewhere.) He makes holes in the bottom of the box for ventilation, adds a toilet paper roll chimney and a hanging rod, and then uses a burning tray of sawdust as the source of smoke. You can see how he uses it to smoke fish here.
Other people have tried their hand at making a cardboard box smoker too and one contributor to Instructables had surprisingly good results. They actually used a hotplate as a heat source, topped with a skillet full of wood chips, and eventually finished the meat in a conventional oven. And obviously, this is something you should only do outdoors!