like showing a card trick to a dog
like showing a card trick to a dog
Said when showing something to someone that they can't possibly comprehend or appreciate. Good luck getting that doofus to understand the intricacies of the budget report. It's like showing a card trick to a dog. I don't know why I bother showing you my cool new tech stuff. It's always like showing a card trick to a dog.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.