If you happen to have an old can of soft drink or beer lying around the house and you're struggling to get a good Wi-Fi signal on your computer, The Chive has a guide to cutting out a parabolic reflector out of the can.
Photo by: Sh4rp_i.
Using nothing more than an aluminium can, a utility knife, scissors and some adhesive putty, they've built a remarkably easy and effective Wi-Fi extender that only takes a few very simple steps to complete. If you're not interested in using aluminum foil, you don't want to solder a tin can, or you just want to broadcast your good taste in beer, this is a solid trick that works surprisingly well. Find the full tutorial and walkthrough over on The Chive.
How to Boost Your WiFi Signal Using Only a Beer Can [The Chive via Discovery Channel]