Bread and Butter

[avern]

This popped into my mind the other day...when is it said? I seem to remember an animated bit where what is supposed to be a serious documentary of something (fish?) zooms in to a close-up with each saying...."bread 'n butter" "bread 'n butter" "bread 'n butter" "bread 'n butter".........

[KRISTENK]

One should say "bread and butter" when two people are walking together and something seperates the two, i.e. a trash can, lamp post,etc. Why? I don't have the slightest idea, my Grandmother taught me the saying.