FL: Have you watched any Don Ho retrospective tributes lately?
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Add "Pho" to "Ho's" song
http://www.medhelp.org/posts/show/226682
And according to these bowl watchers, reasons could range from temperature of the toilet water, to dehydration to hose force.
http://en.allexperts.com/q/Nephrology-975/Foamy-urine.htm
http://www.mayoclinic.com/health/foamy-urine/AN01702