Today I was pre-flighting the aircraft before my flight. I always check the oil because low oil is one problem I don't need. We had enough oil, thankfully, but as I was pulling out the oil stick it attacked me and flung out of control. I tried to back away so the oil stick wouldn't hit me, but the end of the stick (the part in the oil reservoir) swiped my armpit. And of course I was wearing a dressy white shirt today. How does that happen? This was at noon and I didn't have time to go home and change, so now it looks like I am sweating oil. So gross!