Why won't I ever learn

So.. I have this pathetic little garden in the back yard. It has been so stinkin hot here that the garden is even more pathetic than usual. I decided on Saturday morning that I would weed my garden. I was down on my hands and knees, with my little gloves on weeding and sweating. As I round the corner, (outside the safe area) there is a patch of weeds. I know that this is poison ivy. I know that I just have to look at it and I get it, but I just couldn't resist. I yanked. I ran inside and washed and scrubbed my arms. But to no avail. I am covered in poison. All over my neck and face. All over my arms and stomach. Why do I do such dumb things? HMMM>>>>>