a little sneak sneak
When someone does something so small and sneaky that it's like they took one step and now they're saying they've just taken over the world.
My cousin did a 2-yard sneak and now he's telling everyone he's the best quarterback ever.
My mom took one piece of bread and now she's saying she's the queen of the bakery.
My dog sneaked out the door and now my dad says he's the best dog in the universe.