Cactus o' Strength Switch

The Cactus o' Strength Switch is a bell found in front of the Cactus o' Strength used to test the strength of whoever hits it.

Banjo-Tooie
In Banjo-Tooie, the Cactus o' Strength Switch is found in Witchyworld. It needs to be hit with the Beak Buster, Bill Drill and a Grenade Egg in order to make a Jiggy appear.

Banjo-Kazooie: Nuts & Bolts
In Banjo-Kazooie: Nuts & Bolts, the Cactus o' Strength Switch is found in Banjoland. Hitting it hard enough unlocks an achievement, "Test Your Strength."