According to Wikipedia, puns have been around since ancient Egypt. This means indulging in puns is not only historically informative, it’s like opening an anachronistic peephole into humor’s yesteryear.
I love that ppl think that this makes Walmart look ridiculous. However, Walmart's being a sassybitch. Customers have a hard time realizing that a cart full of crap is not fifteen. So yeah, we're going to talk to you like you're a moron :))