I hope others here can relate to this. There you are at the bar, or a party, whatever, and you're prattling on about the fine structure constant, or some such techno-babble, and then it hits you. "Oh goodness," if you're trying to watch your normal potty-mouth, "I've gone and done it again. I've launched into some pompuos geek lecture!" You wrap up the comment as quickly as you can, but it's too late. Does this happen to you? Is there a link to a list somewhere listing "over their head" topics Maybe you've got a funny story. I'd love to hear and learn. So damn awkward at times!!!