I think I probably ABU but I have a colleague who uses phrases like "X is going toilet". This really grates on me but I don't know how to say that it does or if I'm just being unreasonable and it's a regional thing.
Also we work with children and therefore should be using the language we want them to use, especially as lots of them are just learning English, but I think I am going to sound like a major pedant bringing it up.