At the checkout.

Checkout girl: “Do you have kids?”

Me: “Yes”

She: “Here’s a tip.  If you want them to keep believing in Santa, wrap the gifts from Santa in different wrapping paper so they don’t look like the other gifts.”

Me: “That’s a good idea.”

She:  “So, how old are your kids?”

Me: “16 and 19.”

She: “OK…  I feel like an idiot.”