When I was a little kid, for reasons I can't remember, I had to have a catheter...placed. If you don't know what those are....Well, you're probably better off, but I'll explain it anyway. Essentially, catheters are(brace yourself) tubes a doctor slides into your penis. I can't even type that sentence without my legs crossing a little bit. To make things even better, I'm honestly not sure if they even gave me anesthesia. I got another one recently and it didn't hurt (felt fuckin' bizarre and I hated it, but it didn't hurt) but I remember the one I got as a kid hurting like goddamn hell. They did SOMETHING differently. Also, it hurts like a mother to pee afterwards.
Seriously, never get a catheter. Recently, some doctors thought that if they didn't give me one, my kidneys would fail. Long story, it's not important. What's important is that, after about 3 weeks of weaseling around them and getting second opinions, I managed to prove them wrong. My kidneys are now better then ever.
Seriously, fuck doctors. I have a list of experiences beyond those listed above to back up that statement, but I won't get into them here.