I never used to have a problem remembering my wallet. It was always in my purse, right where I needed it. However, with a toddler, the number of things I have in my purse has grown, and the frequency of my taking those things in and out has increased, meaning that sometimes something gets left behind. When it's my sunglasses? No problem. Tic Tacs? Still not a problem, as long as we can avoid tantrums. The wallet though, that's a problem.
You would think that after the first, or fifth time getting up to the cash register and realizing I have no way to pay I would just get in the habit of making sure my wallet is in my purse before I leave the house or enter a store. Or, maybe the fact that on several occasions it has lead to me technically shoplifting because I leave the store with Meg eating a treat we haven't yet paid for would do it instead. Yeah, I would think that too. Apparently though, I like lugging a toddler in and out of stores, wasting time rerunning errands too much, and risking being the target of dicky store security to start giving myself little reminders.
Luckily, it appears I am not the only idiot in the world. Pretty much every time I have forgotten my wallet the clerk has just put my stuff aside, and then continued the transaction when I return. Either that, or I am the only idiot in the world, and they take pity on me because I look so pathetic.
They won't pity me though once I have my awesome arm wallet though...