I clearly remember a McDonalds commercial back in 1989 or 1990 in which the Del Rubio triplets were promoting the triple cheese burger. It ran during Saturday morning cartoons. I was in middle school back then and I liked to draw comic strips that focused on pop culture satire and I remember including the Del Rubio triplets into a strip based entirely on having seen them in the McDonalds commercial and then on Pee Wee's Playhouse.
Contrary to the weird stuff found on the Internet, they were not throwing McNuggets around in the commercial. They were singing a song and playing guitars. Amazingly, I still can "hear" them singing, although I can't remember the lyrics. I had recorded it on VHS tape at one time, but I doubt I would ever be able to find it.
Here's a link to an article that also mentions that they were in a McDonalds add, although unfortunately there doesn't appear to be a video.
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