Know What to Quote in Email Replies

In the land where they teach you how to better manage your household by devoting every free minute to it (the former of which I do enjoy, don't get me wrong), the consensual advice is to wait (agitatedly I suppose) with adding any dish-washing liquid to your dish-washing setup until all the water has run in. Or foam will develop!
Withstanding that foam will be a by-product of the cleaning and shrubbing (or you're not doing it right), I'm sure there is a good reason for this advice. Maybe the fat-dissolving qualities of the detergent are somehow hampered or possibly the foam just makes it hard to find the spoons in the water. Either way, I refuse to heed this advice and pour in the detergent just as the water splashes in with determination and anticipation. I love that foam!
Similarly, if you (and the recipients of your replies) enjoy the foam of quoting full emails with all headers, signatures and quotations, go for it! Still, there are good reasons to restrict yourself a bit:
›› When you compose a reply email, be careful what to include of the original message — and what not.