Pad Hands
When you get so good at playing cards on a pad that you think you're a pro, but when you actually play with real people, you get trashed. Like thinking you're the king of the game, but then you lose to a kid with a candy bar.
I thought I was a card king, but my friend beat me with a stupid hand.
I showed off my cards and got beaten by a kid with a lousy deck.
I played cards on my pad all day and then got crushed by my cousin in real life.