I have been known to.
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HUBLOTDo you say "I think not" to mean "I don't think so"?Yes, you can, but it is a bit old-fashioned and formal, perhaps British English more than American English. This text is very casual, so the substitution does not fit.
HUBLOTHi fivejedjon,Could I ask what you mean by I have been known to? Is it a set phrase?No, it's not a 'set phrase'. I simply meant that I have, on occasions, used those words. I agree with AS that they are rather formal and old-fashioned. I don't think they would be particularly likely to be used in your passage.