A husband and wife are making breakfast. As the husband is buttering the toast, he says, “Did you ever notice that if you drop a piece of toast, it always lands butter side down?”

The wife says, “That’s ridiculous, I bet it just seems that way because it makes such a mess when it lands butter side down. I bet it lands butter side up just as often".”

The husband says, “Oh yeah? Watch this.” He drops the toast and it lands butter side up.

The wife says, “See, I told you so.”

The husband says, “I bet I know what happened. I buttered the wrong side.”