I would say I've never been to Walmart but then I realized Asda's in the UK is Walmart owned. So I have. Funniest story I have from a Walmart is simple.

I went in to get a friends birthday present at last minute because I forgot. By last minute we're talking it was gone 1am and I was due to meet up with her for her birthday in 5 hours. (we were going out of town to the coast for it) She'd been feeling down because her douche of a boyfriend (and my douche of a friend) was messing her around hence it was going to just be me, her and the seaside with some retail therapy thrown in to the mix. Knowing her love for chocolates I went in to get some and maybe a bunch of flowers to go with. In all honesty have you ever walked in to a 24/7 supermarket at 1am? The staff are generally freaks, didn't help I was actually high at the time but I was seriously wigged out by the time I found some suitable gift materials. The cashier was just really bouncy and happy and like me when I wasn't stoned or tired as hell which in my predicament scared the out of me. I pretty much ran the distance back home and never went in to Asda's past 10pm again.