I was a groundbreaking reality TV show that blended hidden camera pranks with heartwarming reveals, often blurring the line between comedy and genuine human emotion. Which show am I?

1. My host was known for wearing elaborate disguises and adopting different personas.
2. The show often involved surprising ordinary people with extraordinary opportunities or fulfilling long-held dreams.
3. Hidden cameras captured the unsuspecting reactions of people placed in unusual situations.
4. The show aired for multiple seasons and spawned numerous adaptations around the world.