Noah was in his back yard building the Ark when his neighbor comes along and says,"Hey Noah, whatcha doin'?"

Noah says "Sorry, I can't tell you".

His neighbor says "Awwww, c'mon" Noah".

"No, I can't" Neighbor, replied Noah. "

"Why not, Noah?"

"Because I can't"

"C'mon, just give me a little hint"

Noah *sighs* "Okay.......... How long can you tread water..........."