74. Poison Ivy

Want to know the quickest way to ruin a nice stroll in the woods? Accidentally walking into a bunch of poison ivy. It sucks! This nasty plant houses a compound called urushiol, which irritates your skin soon after brushing against it. The soreness is often referred to as “contact dermatitis,” and it can stick around for over three weeks. Oh, and the resin clings to your clothes, too.