You have to tell this one from the first-person perspective to get the full effect and change it to fit your situation but it has always worked for me.
My brother/neighbor/cousin... invited me to their son's 7th birthday party. He always spoils his kids so I had to get something that I was sure he didn't have and that any kid would definitely like. So I looked online and in stores and came across an awesome 6' diameter trampoline. It was small enough that they could move it around and put it away in the winter, but big enough that the kid could jump all day long and have a blast. I knew they didn't have a trampoline so I bought it. It came in a big box and I wrapped it with the most colorful paper I could find and put a giant bow on top. When the day came, the kid's eyes bulged when he saw the box and wanted to save it for last because he knew it was good. When it was time to open it, he couldn't have been more excited. He tore it open and when he saw what it was, do you know what that spoiled brat did?!? He just sat in his wheelchair and cried.