Do as the thread title says, it can be a big or little secret up to you.
Last Saturday I was watching the Khan fight with a few of my mates, anyway my mate made a couple of Pizzas and left them to cool on the coffee table in the living room.
Whilst him and my other 3 mates went into the kitchen to discuss what drinks to have next his dog jumped up and licked the pizzas right across the middle. I, of course, didn't want to spoil their food so I let them eat the food without telling them. Felt a tad bad afterwards.