I know that feeling, I went out on a ride and got about a mile away from my house and felt what I thought was a
splinter in my back, so I'm thinking 'that's a little uncomfortable' so rather than stop I was reaching around as far as I could and banging my back with my hand hoping to move the
splinter it got more annoying and I had to stop, I dropped down the top half of my leathers to discover a wasp in the lining of my leathers and he'd been wandering around merrily stinging my back whenever he felt like it

I'd been stung 5 times in total, I wasn't best pleased.
Another time (not riding related) I swallowed a wasp that had decided he wanted to go for a swim in my coke can, it stung me once in my throat and then again about level with the base of my sternum, it's pretty worrying when the inside of your throat starts swelling

so now whenever I leave a can of drink open I always stretch a latex glove over the top of the can
