#2107, in which Oscar gets jealous that Bernie the piano tuner (a human) is getting more attention from Grungetta (this time played by Brian Meehl), so he begs Olivia to go on a date with Bernie - whom Olivia thinks is a grouch at first.
I thought Brian Muehl left Sesame Street in 1984 and Pam Arcerio took over the role of Grungetta that year.