Girl Scout Camp! All the troop leaders would come together and, instead of leading the Scouts, they would act this out FOR the entertainment of the Scouts, with lousy German accents.

Ick ein guten Doktor come from Ger-ma-la,
Ick kann spielen auf der Pi-A-No, and all the other instruments.

My outstanding memory of their performance, is that the stout middle-aged troop leader, who was leading the other leaders, by accident spat off the fake mustache attached somehow to her upper lip, on the fatal phrase:

Ick kann spielen auf der T-U-Ba! It was the capital T's fault.