Mary Blair Elementary (screen grab from Fox-31 Denver)

A seven-year-old boy was suspended from his elementary school for using an imaginary grenade while playing "Rescue the World" on the playground.

The story was featured on Fox 31 Denver. Second-grader Alex Evans pretended to throw a grenade into a box full of, in his words, "pretend evil forces."

"I pretended the box, there's something shaking in it, and I go pshhh," Alex explained.

Unfortunately for Alex, his exploits (heroic as they were) went against Mary Blair Elementary School rules. Those rules include no fighting (real or pretend) and no weapons (real or pretend).

Alex's mom commented that she doesn't think the rule is practical. "Honestly I don’t think the rule is very realistic for kids this age,” Mandie Watkins said. "I think that when a child is trying to save the world, I don’t think he should be punished for it."

Alex is just as perplexed as his mom. "I was trying to save people and I just can’t believe I got dispended," he told Fox 31.

A similar incident took place last month in Pennsylvania when a fifth-grade girl was reprimanded by school officials for bringing a piece of paper in the shape of gun to class.