I hope the irony isn't lost on you that this means you did not pick the toilet in your house, just like you found it hard to imagine other people doing!
Ha, I guess you are right. Though my parents might well have taken me with them on one of their many trips to an untold number of stores and I might have actually been present when they picked a toilet. I don’t remember, I was three at the time.
What I wanted to say that I can’t understand not picking the toilet for a house when you build it (or if you decide to renovate a house), I obviously didn’t pick the toilet in my current apartment.