I've never had one. I'm worried about kidney stones though, since I have a family history of it, and I have an aunt that keeps getting them and it makes her life hell. Every time I start to get a back pain now that's my initial thought "OH FUCK IT'S A KIDNEY STONE I'M GONNA DIE"
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"Not only is pizza attractive and charming, he also has a huge penis." - Awkward Smile