I can't believe leaving it there will satisfy anyone, so here's the rest of the story.
The girl who served me had commented this morning about her new Axolotls (ie: Salamanders). We discussed them briefly tonight while I was buying my groceries, and I tried without success to convince her they were not 'Mexican Walking Fish' but were Salamanders. She has no trouble believing both, but I refused to allow that they were fish.
"You know what they feel like?" she asked. "Like the inside of my mouth! Touch the inside of your mouth. That's what they feel like." She demonstrated by swabbing the inside of her cheek with her finger. "Try it!"
I said "Wouldn't it make more sense if I touched the inside of your mouth? How do I know mine feels the same as yours?"
"Ew, no way!" she replies.
Another girl walks by and says "You can touch my mouth." And she stands there, mouth open, while the girl serving me touches the inside of her cheek. "Ew!" she says, and steps away. She looks at me and asks if I'd like to have a go.
"Sure." I says, and she steps towards me, mouth agape. I stuck my finger in and touched the inside of her cheek. "Ew!" she says, and bats my hand away.
So yeah. I've been inside a woolies girl. Have you?
Epilogue: After we passed around the alcohol disinfectant, I was grabbing my groceries and heard the girl who we'd all been inside say to her customer "Would you like to try? Everyone else has." The customer declined, so I said to her as I passed by "You really should give it a go. Chances like this don't come along every day."