Or, the Revenge of the Invertebrate.
About 10 days ago I spied a caterpillar munching on the succulent leaves of my little beauties, & thinking little more of it, lifted it off & let it drop over the side where it could complete its life cycle on a more harmless diet of lawn.
For the last week or so I've been aware of an insistent irritation & occasional stinging pain in the left thumb. Finally deciding it was time to do something about it, had a good prod around this morning & discovered a near microscopic spine wedged between two ridges of my thumb-print. Some careful tweezer work finally withdrew it, & the pain instantly vanished too.
I suppose the lesson here is not to underestimate even the most apparently insignificant entity, you never know what it might be capable of.