The most silliest, craziest, didn't-really-need-it purchase that you had made for your bike?
I tried to buy the best lock possible. Went on the suggestion to buy an Onguard chain lock. (By all means, they were rated one of the top CHAIN locks!) Got a price for about 40% off and ordered it (now wouldn't you?). Never saw it in person. When I went to pick it up, I swore they made a mistake. This couldn't be it. This sucker weighs about 10 pounds! Kept it anyway since I got such a good deal!