It Is Positively Predictable

      You can count on it: if the plunger was left in the basement, within two months, the toilet will do a "stealth stoppage:" water level just a tick higher than normal, drain blocked.  Flip the lever and you've got an hour of cleanup.

     If the plunger was deloused and left in a small bucket in the washroom?  Rarely have a stop-up.

     The tie-breaker is when there's over an inch of water in the basement -- and the plunger is down there. too, on the far side of the floor drain.

     I own three plungers -- one small and clean for sinks, a big one for the basement floor drain, and a fancy big one for the loo, but the fancy one tends to get migrated to the basement for a spray-down with bleach cleaner, and then why not just leave the ugly thing there?  What harm will come of it?

     And thus the cycle continues.  If I'd just leave the plunger in the smallest room, it wouldn't need to be used.