From Wikipedia:
In a World AIDS Day benefit, the original cast of Avenue Q and the cast of a recent Broadway revival of Fiddler On The Roof presented a 10-minute performance that was essentially a spoof of Fiddler and Avenue Q called "Avenue Jew," in which Trekkie Monster played the Fiddler Theme and, at its conclusion, ate the fiddle.
"Avenue Jew" is a sort of epilogue to Fiddler.
Tevye, his wife Golde, and his two remaining unwed daughters arrive on Avenue Jew, an area inhabited by Jewish humans and puppets (the cast of Avenue Q playing Jewish versions of their usual characters, complete with Jewish American Princeton and Hanukkah Eve).