Edge's spear (Goldberg, Reigns also do it but I always prefer Edge's. Sells setting it up in the corner and spearing Jeff Hardy from a ladder was 10/10)
RKO happens fast.
2 favorites off the top of my head.
Worst finishers I've had troubles believing would be the 1 punch ones (Big show, Reigns) FU/attitude adjustment, Khali old finisher where he squished his opponents head with his hands