WTF - Synthetic Urine?

I think A-Rod needed this!!!

Seriously, why else would someone by synthetic urine?  You buy this either to:
A.  Pass a drug test that you know you are going to fail.
B.  Use it to make up some kind of voodoo/witches spell.
C.  Play a practical joke on a good buddy (it has to be a good friend.  If you didn't like the person, you would just use real urine)

I can't think of any other reason one would buy Synthetic Urine, can you?