The first (or second) time I bought diapers, I was with my boyfriend, and we actually were buying him some goodnights. I was still very new to this, it was about 3 years ago.
I was so nervous. We joked around a bit, but didn't actually think the cashier would look at us funny or say anything. (It's easier buying goodnights than it is buying adult diapers, I've learned.)
I shopped there a lot though, and saw it was a cashier who always talked to me, so I knew she might say something afterall.
Then she did!!