I Have To Go Lose My Retainer

So about three weeks ago my son had his braces (teeth) removed. Time for the retainers. Luckily they cement in the bottom retainer. Not so with the top - it's removable. Now my son is much like most boys. Thank God his head is attached otherwise he would have lost it years ago. So we told him that we bought the first retainer. Replacements are his responsible. Their cost - $225. He said no problem.
As we were driving him to Tae Kwon Do he asked us to book an appointment with the orthodontist. We asked, "why?" He said that he lost his retainer. We reminded him that the $225 is coming out of his pocket. He said no problem. I asked him how did he lose it. He replied with, "isn't my paying for it enough?". At this point my wife and I realized something was up.
So we asked again, "how did you lose it?". My daughters face broke out into a smirk. Ah ha, she was in on it - she knew what happened. Our son had a pained expression on his face. "Well, uh, I um, lost it at school." Where? At this point I should point out that he doesn't lie. He'll try not to tell us something, but if asked directly he won't lie. "Um, in the bathroom". How? "Well, I was pooping and it just fell in." Uh? What? How? At this point his sister starts laughing. I have a mental image of this and start laughing too. My wife doesn't share in laughter - she wants answers. It seems he was popping it in and out with his tongue while sitting on the mug. One pop too many and it fell down . . . and in. I asked him did he think about fishing it out. "Heck no, I just finished what I was doing, flushed, and walked out." I can't blame him. $225 is a lot of money, but it's better than putting something in your mouth that was once in the toilet. There's just no way you could clean it / sanitize it enough.
The result of the. We now have a new phrase in our house. When you need to use the bathroom you can politely say, "I have to go lose my retainer".