A feather, a large rock
Place the feather on a table and ask someone to come and blow the feather off the table. Place the rock on the table and have another person come and try to blow it off the table. You may want to have several people together try to blow the rock off the table.
Discussion: We must be strong. Our testimonies must be form, solid, and built on the rock of revelation. Our foundation must be the Savior and we must believe in and follow the prophet of God. If we have this foundation, we will not be blown away by temptations.