- a bowl of small treats
Before beginning the lesson, pass out the candy and say "I think we need a little treat before we begin", or whatever you feel is appropriate to let the class know that it is fine to eat the candy at that time. It is also helpful to eat one yourself.
Begin teaching and ignore the candy for a while. At the appropriate time in the lesson, ask how many didn't take a piece of candy, how many ate the one they took, and how many are saving theirs for later.
Relate this to sharing the gospel with others. Some people will simply not be interested, some will take it in right away, and some will "save" what we have told them for later.