What are some good 'I am busy' lines?

HELP NEEDED... This guy asked me if I was busy tonight (he has done this before) and I had no clue what to say so I made up this excuse that I had to go to my church for a meeting. That excuse won't last me long, I need other things that are very believable and can be used more than once... any ideas?
What are some good 'I am busy' lines?
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