Use the acoustic sensor to program a clapper switch, which activates a LED when you clap your hands. By means of a relay, also lights or other household devices can be switched (TV, HiFi system, coffeemaker, …).
For advanced users: To ensure that the switch is not too sensitive (triggered by every sound), program it in such a way that it is only triggered if two claps are recognised within 2 seconds.
If you need any help, take a look into the worksheet or watch the tutorials.