This is very simple. Don't screw it up.

Attack the person above with an item of your own design which is slightly better than that person's previous attack. Also, as attack escalate, add "+1" point.

Avoid fatalities like "hits you with a bus." Also, avoid assinine leaps such as going from a fly turd +1 to Voltron +2. Voltron is NOT +2.

For example:

Hits you with a brick +4

Hits you with a baseball bat +5

Hits you with a shovel +6

Let's see how far this goes before some dumbass screws it up. I'll start.

Hits nobody with a Fly turd +0