Do any other DFW Gen X people remember dialing these weird telephone numbers back in the day?

I grew up in the Dallas-Fort Worth area and as kids we would dial two numbers on the phone that would produce sounds we called the "headless horseman" and the "grandfather clock". The headless horseman sounded to our young ears like horse hooves on a paved surface and the grandfather clock like large clock ticking. The sounds just played until you hung up. I am pretty sure they were test numbers/sounds for AT&T technicians...but they fired the imaginations of me and my friends on sleepovers.

Does anyone else know what I am talking about? Anyone remember the telephone numbers?