Was reading Uncanny X-men #150 in a tpb. Magneto builds a super duper fortress with a lifelike full sized hologram projector he sends to all the world's leaders but the X-men are able to break in easily while he sleeps as he does not have security cameras, sensors or security gaurds etc.
Evil cult from Halloween III Season of the witch. They plant special chips in Silver shamrock masks and hope to kill ALL of America's children. Thing is not everyone celebrates Halloween, not everybody can afford those masks and not everybody wants to dress as a skull, pumpkin or witch.
Killer from Watchmen murders Eddie to cover up his planned crime. Draws attention to himself throwing Eddie out the window...
Others?