Because You’re Not Mozart…
Ordinary is boring, and this music teacher knows it very well. So instead of the old and traditional, “do not touch” sign, this funny board came to action. It states that the students who are not Mozart shall not play piano without permission.
Source: 5funfacts.com
The phrase seems pretty reasonable until you read the ironic ending of the tag line, “Because he is dead.” In short, this teacher is saying not to play instruments without actually saying the phrase. We surely don’t know if this way is working well for the teacher, but we are sure it’s doing great for humor.