Location: a secret lab on the shores of lake titicaca
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2 Blonde Roofers
2 blonde roofers were working on a house .one of them would pull a nail out of her nailbag look at it and either throw it away or use it. the other asked what are you doing? the first said ,oh those nails were pointing the wrong way . the second said , you fool those are for the other side of the house!
Times have changed. When I was a kid, they were Polish framers (although they may have been blonde too, come to think of it--no one ever mentioned their hair).