Morality of fashioning something to stab the arm of your seatmate if they touch you?

[u/TheMaidenOfDragons]

Just saw this on threads. What’s the morality of using an earring and fashioning it to your sweatshirt so it stabs your seatmate if they bump into you (whether or not it was an accident - still getting poked). Worst case scenario with high turbulence, you’re getting stabbed.

I’m going to go with immoral for this scenario. And also illegal.