"I'm not being funny, but..."
usually (but not always) followed by a scathing statement? I've found it more prevalent here in the UK - I just wondered how far it spreads?
If you have heard of it, would you mind saying where you're from, if it's not local where you heard it, and also (if you can be bothered) how you might explain to someone (English-speaking or not, or unfamiliar with the phrase) what the phrase means, and when/why it is used?
Additionally if anyone knows a similar phrase in any other language I'd be thrilled to hear it! :)