The pants I put on today have a hole in the front right pocket, so my keys, which are normally on a chain, would swing against my leg all day. So I took them off the chain and put them in the other pocket. Later, I left work a bit early to pick up my new cell phone. Then I got home and discovered I'd left my keys at the office, since they weren't attached to me. Things like this remind me that being clever in accommodating my forgetfulness is not the same as not being forgetful.
Another hour round-trip to get into my house seems dumber than waiting for a housemate to get home and let me in, where I can get the spare key to my car. Of course, technology being what it is, I can sit in the park next to my house and write this, since the wireless network spills over.