to continue their theme maybe they need to add beer, cigars and condoms
I find it mildly embarrassing and equally annoying to buy condoms, and yet I definitely do not want to run out.
The trick is to select the final item for comedy value. A cucumber would be traditional, but many other things also work. A sandwich with a gag at the till of "I'll need to keep my strength up" suddenly turns it into a shared joke between you and the cashier and eliminates the embarrassment.
Cheesy? Sure. A useful personal mental self-hack? I think so. Decide for yourself :)
Or for both, contact lens solution, staples like earbuds, toothpaste, etc.