Typically because of all of the cussing, and game play.

Dyson typically has the top rated vaccums. Bissell and Hoover vaccums are also quite good. There are different categories such as canister, small, and upright vaccums to choose from.

Typically, about 5 to 5-1/2 tons.

Weights given in such a manner typically refer to the rated load capacity, so a 20 ton truck would be rated to carry 20 tons of payload.

It depends on the amount of violence, and vulgarity. Some ninja movies, like Teenage Mutant Ninja Turtles are not rated R. Typically though, ninja movies have several violent scenes, therefore they end up being rated R.