Swedish musician Mattias Krantz, who enjoys making the most out of his instruments, tuned every key on his piano to E. It was a rather onerous task but he wound up making it sound rather interesting, particularly in different keys.
The biggest E note ever played on a piano
He also used this giant E piano to gently fool some online piano teachers. Several of them thought his piano was broken.
Something is wrong with your piano…your piano is broken.