Lousy way to end the day
Guy I worked with did similar. Was fixing up his dirt-bike and test rode it w/o a helmet. Ended up dumping it and put a stick through his cheek. A trip to the hospital and some stitches and it was all good
Closest I've ever had was mountain biking. There was a branch over the trail that I ducked, but it had an offshoot that was pointed straight up to trail; I never saw it. Went between my temple and the padding of my helmet and jerked me off my bike. Just a bit of scuffing and a bruise but that's awfully close to the eye. Spent the next few minutes pulling wood bits out of my helmet.
Cheers,
Cory
PS: If ever in that circumstance, leave the object in. It blocks the bleeding and the ER can deal with it better than you.