I can identify with your experience with the flowering plum.
While doing some vigorous weeding on a hot, humid day, I used my shirt-tail to wipe the sweat off my face and ...
blood everywhere. Having no clue where the blood was coming from I quickly ran to find a mirror. Yep, blood pouring down the center of my face. Like you I worried if any of the neighbors had been looking.
Had gotten jabbed in the center of my forehead by one of the sharp Yucca points and, well, let's just say I now give them a wide berth when I walk in that part of the garden.