I feel especially bad for the mice, to have gone through what they did just to be euthanized. I thought the mice and gerbil stuff was just an urban legend and nobody actually did that.
http://www.straightdope.com/columns/read/478/is-it-true-what-they-say-about-gerbils
Not clicking on that link. Do not need to know any more. 
It just lists what doctors have actually retrieved from down there and that there are no gerbils on the list.
My ex husband's Mother was the Medical Superintendants PA at a hospital and would have to type up such reports, in the 80's. She wrote reports of cases of the woman who presented to Emergency with a cucumber firmly wedged in her bottom, claiming she had fallen backwards into the fridge and landed in the crisper.
....another poor soul must have felt amorous in the toilet and decided to slide the toilet brush handle too far up his ass.....unable to drive himself to hospital, he presented in a taxi, covered in a towel....hard to wear underpants with a toilet brush stuck up your botty bot.
Another guy got his penis wedged in a length of steel pipe. They had to call the hospital's fitter and turner to cut off the pipe. The poor guy also had to attend for wound dressings weeks afterward. None of these are urban myths, they are actual cases.
I have no actual gerbil cases to report, although this story has been around for a long time. I believe it, for the most part. Apparently, the sexual thrill is when the gerbil goes into spasms and starts to die of suffocation in the persons anus. Not my idea of fun, but that's what I heard is the actual thrill, the spasms.
was it something I said?