I have two cats with this disorder. Mother and son. Beautiful sweet faces but total Jeckyl and Hyde personalities! They tend to make my other cats lives miserable lol. The momma is a shoulder angel and she doesn’t give any warning when she jumps on you, if you walk by her and she’s on something waist high she’ll make the leap. Scares the crap out of me most of the time :)
Our cat is a shoulder cat, too...but he launches from the floor! Interesting part is because he and my hub are bonded (they fight and play daily) he only jumps on my husband’s shoulders...He knows NOT to bother me...I am only his food maid.