"Hava Nagila" is a song featured in the Season Two episode, "Ike's Wee Wee", and the Season 13 episode "Fishsticks". The song is instrumental in both episodes.
Hava Nagila is a Hebrew folk song that is popular among band performers at Bar and Bat Mitzvahs.
It can first be heard in "Ike's Wee Wee", and it is played by a background bagpiper at Ike Broflovski's funeral.
The second time it can be heard is in "Fishsticks", when Cartman envisions an army of Jew-Bots.