I don't know what my son does in the toilet, but he's clogged the drain enough that he knows where the cut-off valve is. Usually we can punch it through with simple plunging.
This weekend, Shan's folks were in and her dad clogged the toilet. Simple plunging and it was working again. Then, at 10:30 everyone gets ready for bed and goes to the bathroom. After they finish, it clogs again for my wife.
Clogs solid - an hour of plunging has no effect on it. It does allow water to drain out very slowly though, so we try pouring warm water to see if it will loosen anything but to no avail.
I call my folks after 11pm. Luckily, dad was still awake and I went over to borrow a toilet snake (and use their facilities). We snaked the toilet as best we could but still no good.
Luckily, the Internet came to the rescue. A few google searches brought us to this site. It seemed odd but at this time we figured - why not?
Like most of the others on the site, we found that it worked as simple as adding the dish soap, hot water, and a quick plunging and eveything was flowing properly again. Hopefully, you don't even need to know this but, if you do, now you know.