Go to "The Suburbs" or "More Than Meets the Eye" levels. Go to the power plant to find a Decepticon there, but you can also bring one there. There will be capsules marked "Danger, High Voltage". There are about 100 of them at the power plant. Pick up a capsule and throw it at the Decepticon to cause a lot of damage. This can cause police cars to come at you if you are near the city. There are a few of these capsules also at the junkyard. The same can be done with gas trucks in the junk yard or the gas tanks in the gas station near the junk yard.