Incoming!
When this squirrel had mistaken a man's leg for a tree, both parties were in for quite a surprise...
"Was on a hike and a young squirrel came rushing out of the bushes, climbed up my leg up to my waist, realized I wasn’t a tree and let out a horrified squeak, then leapt off and ran away. The little [guy] then started swearing at me from a nearby, actual tree."