Sheepdog Trials:

Set up a course of obstacles in the garden. Make sure you include things to go around, over and under.
Blindfold child A
Child B guides child A around the course with commands of 'left', 'forward', 'up', 'down' No other additional commands to be used.
Health and safety notice: Rotten brothers are likely to guide unsuspecting little sisters so that they fall over or end up in the pond. Supervision of rotten brothers is therefore necessary to optimise trialing pleasure for little sisters.

(Border Collie costume optional)