Honestly? Didn't expect to get paid(this isn't an entitlement thing from a peon perspective, so get that outta your head) and figured I had nothing better to do that day. Otherwise, I could sit-around and listen to my roommates bitch about how they didn't really believe I got a new job, they think I should never have left my old one, or go somewhere(library? mall? zoo? bar?) where their words would echo in my head anyways.
All but one of these places, the start date was worked more around my schedule than theirs. There have also been a few places that weren't ready for me to do anything on the date they said they would-be, or the "start-date" was nothing more than an hour of filling out paperwork.
Why wouldn't I take the opportunity to potentially knock that out early on a day that is more convenient to me for whatever reason? My energy levels are all over the place, so whenever I have plenty and an opportunity to use it properly, I gotta strike while the iron's hot.