Bikes - Cars - Tractors can....
1. Get a bunch of guys who've never met each other, from all over the globe, to take the time to help each other, share thoughts and ideas, agree to disagree but not get insulting with each other and work toward similar but individual goals.
2. Keep our attention into the wee hours of the morning.
3. Isolate our thoughts in a theraputic way.
4. Entertain our minds as we do other things.
5. Keep you in the garage when you're significant other has other ideas for an evening.
any other stuff to add to this list?