Once when I was a kid I found this friendly old dog wandering around in a nearby park, so I petted it, hugged it - and next day I get the horrible water blisters all up my forearms and neck. The dog must have been strolling through a poison ivy patch some time before. I am extremely allergic to poison ivy and have been since I was a kid. And of course this particular incident occurred in summer, when your sewat makes every itch ten times worse.
Lots of calamine and oatmeal baths were the order for me.
Also, when a kid, I was at a picnic and told by my parent to “just pee in those bushes over there.” You guess the result.
HAHA!! Same thing happened to me (I was about 7 years old). Our family was hiking in the woods. Parents told me to "pee in the bushes". I must have squatted right over poison ivy, because that's where it started. It spread everywhere - including inside my ears! I ended up at the doctors. Seem to remember he had to give me a shot of something, and I remember being plastered with calamine lotion. I avoid poison ivy at all costs!