I’m one of those perennial weirdos who actually prefer to use the self-service checkouts. Yes, they’re often broken and yes, they are a cynical ploy by major supermarket chains to outsource cashiers’ work onto the customers themselves and shrink their workforces, but it also means I can get my shopping done without having to engage in one more awkward social interaction.

There are psychology papers galore about how younger generations are more comfortable with self-service checkouts not because they’re more “tech-savvy” but because they’re more comfortable with atomised living than their more communal forebears. That goes triple for Si, because of her possessing abilities she still doesn’t entirely understand, and because she’s on the lam.