Saturday Night Live (1992)
Aired: February 22, 1992 on NBC
During the "Coffee Talk" sketch featuring Mike Myers, Madonna, and Roseanne Barr, Barbra Streisand made a surprise appearance!
In the skit, the three Jewish broads from Queens had all finished saying that Barbra was "like buttah." Barbra poked her head out and said, "All this talk about food's got me hungry, girls!"
The audience went wild and the three "Coffee Talk" girls were genuinely surprised. It was all orchestrated by SNL creator Lorne Michels. Barbra then air-kissed Madonna and waved to the audience before she made her exit.
The SNL skit is available on the DVD The Best of Mike Myers (see Amazon carousel below...)