Human urine and beer are superficially similar...?
Both are kinda yellow-colored. Both have bubbles, to the extent that if you shake up either you can get a good head of foam on them. Both are mostly water.
I'm convinced that there must be a scientific, logical, concrete, fundamental, causal explanation for this similarity, and one of you punks and/or eggheads is going to tell me what it is. He, she, or it, (i.e man, woman, or robot) who best answers this question for me, will be bestowed with the honor of *BEST ANSWER* for this question.