I believe the Tolner Rebbe says the true joke of two Chassidim who ended up in hell, a Lubavitcher and Breslover, so the Breslover starts shouting “Reb Nachman, Reb Nachman,” whereupon Reb Nachman looks down from Heaven; seeing his Chossid’s plight, bends down, stretches out his arms and shleps him out of hell, and the Lubavitcher figures “well it’s worth a shot?!” so he begins to shout “Rebbe, Rebbe,” so the Rebbe seeing his Chossid’s plight, bends down, stretches out his arms, hands him a dollar bill for charity, and tells him “Hatzlachah (much success) on your mission.”