Bladder-control spell

The Bladder-control spell (created by Amos the Semicontinent) was made for long car trips. As its name suggest this spell is used to stop a person from wetting themselves. The incantation is unknown but as most of the incantations in the series are comical we can assume it would be something like notontherug (not on the rug). It is often used after casting the Caffination spell.