Why we became strong when there is a fire?

It's called the 'adrenalin rush' =) There was once when a house burnt down. The people inside could carry refrigerators and appliances easily. But when the fire was out, they couldn't carry all the things back to the house anymore. *LOL* Anyways here's a joke about fire: A fire started on some grassland near a farm. The C.D.F. fire department was called to put the fire out. The fire was a more than the C.D.F. could handle. Someone suggested that a nearby volunteer bunch be called. Though there was doubt that the volunteer outfit would be of any assistance, the call was made. The volunteers arrived in a dilapidated old fire truck. They rumbled straight towards the fire and stopped in the middle of the flames. The 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. Watching all this, the farmer was so impressed with the volunteer fire department's work and was so grateful that his farm had been spared, that right there on the spot he presented the volunteers with a check for $1000. A local news reporter asked the volunteer fire captain what the department planned to do with the funds. "That oughta be obvious," he responded, wiping ashes off his coat. "The first thing we're gonna do is get the brakes fixed on that darn old fire truck." =)

I think our adrenalin has got something to do about it. When we panic our heartbeat will all of a sudden go up. The blood will be pumped much more faster into our muscles. This means that our muscles has more supply of oxygen that it needs. After this process happens, we can carry a much heavier load than we use to.