What really makes it hard for me is when I use public transportation, sometimes no one is willing to give up a seat in front for me, even though I carry a Medicare card and get half-fare discounts...when I ask, they'll get up but they get such an attitude about it "Oh you're not disabled, you're fat, that's why your knees hurt...some SOB kid KICKED me in the knee a few years ago, right after I had it drained...people can be so cruel and thoughtless because they don't consider a knee problem a disability...Which would change quick if it happened to them...I wish they could walk a few blocks in my shoes.