This remind of something that happened late 90's / early 00's.
I was out Christmas shopping with my nan. We were in HMV and while I was looking through the music CD's she went over to look at the DVD's for one she wanted, something like Cadfael or Inspector Lynley.
Anyway, while I was looking at the CD's I just heard my nan's voice shout very loudly across the shop as she walked towards me "They haven't got the VD I want."
Everything just seemed to freeze and the place went deathly silent. Then the staff by the tills just started laughing and the guy next to me was clearly trying so hard not to laugh. I think I went bright red. In the end I just said 'Never mind, Nan, we'll have a look elsewhere" and ushered her out of the shop as quickly as I could.
I doubt she ever realised what she'd done, and she'd have been mortified is she had.