Classic ginger blonde moments...

My sister: I can't believe that the government is saying we can't eat ham now as kids! I mean, look at us, we've been eating the stuff for years! What's wrong with cow?
Me: ...? Kirst, ham is from pigs....*giggles*
My sister: I always thought it was from cow? *loses all continuing arguments* really, pig?
Me: Kirsty, what colour was the grass in the olden days? (hoping to catch her out)
My sister: ...red? No, yellow...?

Notes

Cold-blooded murder of the English tongue...