I love the lyrics of "Sal Tlay Ka Siti". They're not laugh-out-loud funny, but I think they're the most clever in the show.
"Sal Tlay Ka Siti,
not just a story mama told
But a village in Ootah,
where the roofs are thatched with gold."
"The most perfect place on Earth,
Where flies don't bite your eyeballs
And human life has worth."
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."