When I was younger, I would say after dinner that I had “just enough room for dessert.” It didn’t work well with mom, but my grandma would ALWAYS give me a cookie whenever I said that.
My grandma makes the best cookies.
I remember when I was a kid, everytime there was something I didn't like I said "I'm not hungry enough for this but I'm hungry enough for desert" hoping I would get sweets instead of healthy food