A Day in the Life is a cleric spell that turns the target into a halfling for one day. Class abilities are lost for the duration of that one day, and equipment does not change size with the target.

Solipsism is another cleric spell. It creates an illusion that the caster automatically believes. Other creatures must pass a saving throw if they wish to believe in it. Any creature which believes the illusion, though, treats it as real - i.e. a character can cross an illusory bridge.