Didn't do it myself...
...but stood by and watched as a urologist shoved a catheter the diameter of my little finger into an old man's penis and used a huge syringe to suck out an endless stream of blood clots the size of grapes. Very nasty.

Also, not done by me, (but I was in the next room so it nearly counts) a junior doctor catheterised a man but accidentally used a female length catheter. They're held in place by a balloon you inflate in the bladder after insertion. Unfortunately, because she'd used the wrong length catheter the balloon didn't get as far as the bladder and got inflated in the urethra... Lots of blood was the result.
(Mary Mandolin still had it on, Sat 14 Mar 2009, 19:13, 3 replies)

*winces*

( idonthaveafunnynickname Drink-Aware? Sure. I'm aware I want another drink., Sun 15 Mar 2009, 20:12, closed)

??
You have different lengths of cath in the UK? How weird-we're all about the unisex length here.


puzzled
(TDub Nunc id vides, nunc ne vides on, Sun 15 Mar 2009, 23:46, closed)

.
This is going back about 3 years. Nowadays male/female lengths are out, unisex length is in (possibly because of incidents like that).
(Mary Mandolin still had it on, Tue 17 Mar 2009, 11:49, closed)