They are playing music
Nasreddin Hodja

Hodja was returning home one night with one of his students when he saw a gang of thieves standing in front of a house, trying to break the lock. Hodja perceived that he would probably get hurt if he spoke up, so he decided to stay quite and pass by quickly. But his student however, did not understand what was happening so he asked:
- What are all those men standing there doing?
- Shhh! replied Hodja. They're playing music!
- But I can't hear anything!
- Well we shall hear the noise tomorrow! Hodja said.