First day on new job, already in trouble...?

Yesterday was my first day on the job -- I work for the county in the 'animal waste disposal unit' (we pick up dead animals on the roads and haul them to the dump). So, there are four of us that do this, I was riding with one guy in a truck for most of the day, picking up smashed dogs, cats, a deer, the usual stuff when we get a call on the radio about a dead cow way out in the sticks. We drive over there and the other two guys are there with a big trailer hooked to the other truck. Sure enough, there is this BIG cow on the side of the road all bloated up and stinking with bugs all over it and the other guys start snickering. They hand me a chainsaw and tell me to 'handle' this one while they go eat lunch, then all pile into a truck and drive off. I know they're hazing me so I decided to use logic instead of getting mad. I opened up the gas cap on the chainsaw and poured all of the gas on the cow then lit it. I must admit, it made a BIG fire and was still burning when they got back. My boss was crazy mad -- screaming and yelling and getting all nuts. He told us all not to say anything about this to anyone or we could all lose our jobs. i just thought it would be easier to shovel ashes vs sawing up a dead cow. Should I be worried? Why should I be in trouble for using my head?