You can add adults in face paint or jester hats to this list. Or fancy dress in general.Sniper on the top of the Colin Bell, graze shot to the arm, then kill shot if they cross the halfway line.
Anyone bringing a poster asking for a shirt, take them out in their seat.
Half and half scarf, in the stomach, let them bleed out.
Also people who wave at the camera. Especially when their team are losing.