WELL!?! What next?

I think I've probably commented that we get funny "weeds".
In the "early" days, just after the lawn gained borders, we got a few crops of "Snapdragons" (Antirrhinum): this year the herb pots sprung a couple of Lobelias on us and we've NEVER grown them; there's a tall, purple, thing, yet to be identified, snuck in from next door.
I'll own up to having had Tradescantias in the past, but I don't think we've seen hair nor hide of them for over 5 yrs, not so much as a flicker of Tradescantial green ...
Now these.