Lavatory Pass?

We have a little play room under our stairs and sometimes my two girls (ages 6 and 8)will go in there shut the door and start creating all sorts of new games, and even some new rules for our house. So on Saturday they are in there sitting at their little desk making something. They come out with about 15 Lavatory Passes. That's right- lavatory passes. Really.....lavatory?? They then begin to tell me that anytime I need to go to the bathroom, where ever I am in the house, I need to come to them to get this lavatory pass. Okay fine, I'll play along. But of course I forget..........next thing I know,(yes, I'm in the bathroom) and they are pounding on the door "Mom, you forgot your pass!" They tape the pass to the door, for when I get out, I can bring it back to them, since you know they only have 15 of them.
This rule didn't last too long in our house, they got distracted by something else, and were on to the next idea. Anyways, it was entertaining for me. It strikes me funny that obviously their teachers must call their bathroom passes- lavatory passes, surprising for a 1st and/or 3rd grade teacher. Just a little something to keep a smile on my face. :)