I'd say "Most of the time, I'm just kidding around. But there are times when I'm not". The second sentence sounds fine, although other solutions are also possible: a comma, a semi-colon...
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PieanneI'd say "Most of the time, I'm just kidding around. But there are times when I'm not".Why would you begin a new sentence? Why not "Most of the time, I'm just kidding around, but there are times when I'm not"?
The second sentence sounds fine, although other solutions are also possible: a comma, a semi-colon...
PieanneOr to stress the opposition between "kidding around" and "not kidding around".