If your huge jumble of keys is starting to get uncomfortable, DIY website Instructables shows us how to add them to a Swiss Army-like folding tool.
The project isn't that complicated, though it could require quite a bit of elbow grease depending on the tools you have lying around. Essentially, you take a folding hex set, remove the tools, and replace them with filed-down versions of your keys. Some people recommend a bench grinder and a Dremel, but others have gotten by on similar projects with just a metal file and a lot of work. Hit the links to see how its done — we've shared both versions of the project, each of which has some different ideas but with similar results.