A brunette asked her blonde friend if she could get her a clean glass of water A.S.A.P., so the blonde nodds and takes her friends empty cup and hurries off, several minutes later the blonde comes back with the glass of water and hands it to her friend, the brunette takes a sip and said,

"Whoa this tastes pretty good for water"

Then the blonde replies,

"You won't believe how many times i had to flush to get it this clean"