This is so true! I have experienced this many times and I hear it almost daily. I have coworkers and friends who always say "on yesterday, tomorrow, today, etc." It drives me crazy but most of them are actually educated. For example, people will say "I am glad God brought us here to worship on tonight." I have also heard people say things like "I enjoyed speaking with you on yesterday." I was very confused the first time I heard this and actually brought it up to my coworker as I was helping her write a letter as a follow up to a job interview. She seemed very confused as to why anything was wrong with the phrase. I am from Kansas and I have only heard people say this since moving to Tennessee.