I did similar in Biggleswade years ago, when Asda first opened. I went to see what it was like, came out with a bag of shopping and started hunting through my pockets and wallet for my return bus ticket, only for it to fianally dawn on me that I was standing by my bike
One reason was not wearing cycling-speffic clothes when doing errands by bike. The other is, of course, that I'm a feckin' div