Believe It Or Not
One year my wife decided to give out salt and pepper shakers filled with candy for mishloach manos. My wife always prepares the Purim gifts and I usually have nothing to do with them besides their delivery.
Testimony
Trusting Claims That Can Easily Be Checked in the Gemara
The principle that people do not tell a lie that is bound to be exposed, so a claim that can readily be verified is believed even from someone not normally trusted.