Rah Ice Cream
If you look closely, the ice cream container Buffy and Angel are eating out of is "RAH" ice cream. This may be an allusion to the cheer "I Scream, You Scream, We All Scream For Ice Cream" (1927 - Howard Johnson, Billy Moll, Robert Kin)...the next line of which is "Rah! Rah! Rah!"