This is the best one I've heard in a long time

A fire started in a pasture near a farm in eastern North Carolina. The fire department from a nearby city was called to put out the fire. The fire proved to be more than the city fire department could handle, so someone suggested that a rural volunteer fire department be called. Though there was doubt they could be of any assistance, the call was made.
Five minutes later, the volunteer fire department arrived in a dilapidated old fire truck. They drove straight towards the fire and stopped in the middle of the flames. The volunteer firemen jumped off the truck and frantically started spraying water in all directions. Soon, they had snuffed out the center of the fire, breaking the blaze into two, easily controllable parts.
The farmer was impressed with the volunteer fire department's work and so grateful that his farm had been spared. The next day he presented the volunteer fire department with a check for $1000.
A local news reporter asked the volunteer fire captain what the department planned to do with the funds. "That should be obvious," responded the captain. "The first thing we're gonna do is get the brakes fixed on that there fire truck."