Moo becomes disappointed

Am I mean because I laughed at this? I opened a new can of tennis balls and the noise scared Moo the Cat. He started to run away but then realized that the sound ~could~ possibly be like that of a can of vacuum packed tuna opening so he ran up. I let him smell the tennis balls and he wrinkled his nose and slinked off, disappointed.

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 Other kitty "cruelty:"

I tease him with the treats, too! I put them on his back and he gets confused because he can smell them and feel them but doesn't know exactly where they are. Then they fall off, he eats them, and is so happy. He's not the smartest kitty.