The toe-shaped bruise I expect to have on the back of my right leg about three inches above the heel is from high-speed impact with my left big toe. I don't know how I managed that, but it woke me up enough that I got out of bed.
The oddly shaped one on my upper right arm about three inches below the shoulder is from a sudden catch of a heavy box fill of 200 file folders. Legal size file folders are shipped in a box too long and unevenly weighted to balance on top of the head without a hand steadying it.