French Bread

Two old guys were sitting on a bus bench when a good looking young blond with a short skirt got off.
One old guy says to the other :
- Boy I sure would like to get a piece of that.
The other old guy says :
- Yeah, me too but mine just doesn't work anymore.
The other one says :
- Don't you know how to keep that thing working ?
He says :
- No, how do you do that ?
The other old guy says you have to eat a lot of french bread.
So this guy goes the the store and buys 100 loaves of french bread.
When he gets up to the checker she tells him :
- Don't you know thats going to get hard before you eat all that ?
And he says :
- Oh ! you've heard about that too !