A Riddle

Once, i was riding on a truck. Open convertible truck that is. Now the truck had to pass under a very low bridge. But the truck with me was a few inches too high. I thought a lot and decide to use my large sharp nails to slice off the top two inches off the truck. But, then a kid suggested to take the air out of the tyres. That's called good lateral thinking....coming to thinking, there was still a problem..my head was too large..and i thought a lot on a possible solution and dint seem to help at all....

and then i stopped thinking.