I would like to transform into optimus prime, to save and protect the world from decepticons. I would invent a special bomb shaped liked a card and it will detact any Decepticons. after detecting them, it will auto activate into a bomb that triggers in 2 minutes.

Before the decepticons arrive, the placement of the bomb are ready before they arrive.
Alternative is, when they are attaching, the bombs can be tossed over by the autobots to the decepticons body and it will trigger immediately.
By the way, here's the trailer of the TRANSFORMERS -DARK OF THE MOON



I really Hope i could get this :)