Source of a Robin Williams quote?

Years ago, I read a snippet of a Robin Williams standup routine that stuck deeply with me. I have searched without success for the original snippet or anything that supports it as being an actual quote from a Williams routine.

The quote, as best I remember it, has Williams playing himself as a 90-year-old man.

“Do you remember me? I useta play an alien on TV - ‘ninny-nanoooo!’… then the real aliens landed, and it wasn’t funny any more.”

Source? Anyone? Cece? Bueller?

I’m guessing from memory. but it sounds like “Grandpa Funk,” the last track of his first album, Reality - What a Concept.

Bingo. A little searching for a transcript and that nails it. Thanks.

The quote is a standard for me, and in the household, “then the real aliens landed” is a frequent punchline for things where reality has been blindsided.

A variation of this line, IIRC, was also used in his first HBO standup solo special.

I’ll need to run that down, too. Thanks. The partial transcripts of the album have different wording that I recall and it may be the HBO version I have on mental-file.