I bet you're tired of going downtown to buy new clothes. Ceres, the solar system's largest asteroid, has less than 1/40,000th the mass of Earth; the Moon, a mere 1/80th. These objects are the heaviest you're likely to find - there are heavier moons and entire planets you could consider using, but to be honest from this point of view it looks more like using a succession of hundreds, thousands or tens of thousands of smaller asteroid impacts would be a better bet. Basically, the point here is that modelling impacts like these is a tricky business. Atmospheric considerations are ignored here since it is far more energy-efficient to manually remove the Earth's atmosphere, move the planet, and reinstall it. Except that there’s an electron at the edge of the universe and we don’t know where it is (apart from how far away it is), and so again we don’t know its gravitiational field. You never know when you might want to significantly alter the orbital path of the Earth. Suppose they were all at the exact same point on Earth (which they won't be, thus mitigating the effects of the jump). Lotsa modifications and crazy effects for your edification and downloading pleasure!

A converted Victorian terrace guarded by a large, loud and lethal-looking Alsatian was pleasant enough but no one would put it on a par with The Crucible. That idea by itself is not enough to make a game. One day I was thinking about what kind of game I would make for Nintendo's upcoming Revolution console, and I thought it might be neat to use the controller as a paintbrush to paint pictures on the screen. What this all means is that nobody will use it to make rugs because there're too many sprites(haha). Which means the distance the Earth moves when everybody jumps will be one trillionth of the distance that all the people jumped: that is to say, 10-11 metres, or about half the radius of a hydrogen atom. With half of the Sun's radiation blocked/reflected in the opposite direction, the Sun now has a net thrust upwards (i.e. in the direction of the "hat"). This structure would not be in orbit around the Sun, but static, what is billiards remaining aloft using the radiation pressure of catching and reflecting solar energy. Direct matter propulsion. Same method as above, just using gigantic mass drivers/railguns to fire huge quantities of matter away from Earth, instead of a rocket exhaust.

Plan it right, and you can couple it together with the Earth with gravity alone, using the solar wind to balance out the Earth's gravitational attraction. Wait long enough, and the solar wind blowing the sail outwards will take the Earth outward too, since the two are gravitationally bound together! This can be employed to move the Sun and Earth in tandem to a place where the Earth can more easily be destroyed. Unfortunately, that place needs to be immovable, which is impossible. Also, what he didn't specify is that he also needs an equally immovable fulcrum - equally impossible - and a lever of stunning length which is unbreakable. We don’t know one thing: there are some people standing around the table, and we don’t know where they are, so we don’t know what their gravitational fields look like. Sorry the screenies aren't in-game, and I'm even one of those people who's never had the downtown-lag, but I'm still not going there just to decorate. Altogether that's a mass of one billion tonnes of humanity jumping ten metres in the air. Suppose that there were ten billion people (another overestimate - there are about 6.4 billion at the time of writing).

Suppose that they all jumped ten metres in the air (a huge overestimate, fifty centimetres is more likely and probably much less). No more telling everyone on the lot to stop what they're doing and come over to change clothes, now they'll do it just walking through the door! Thanks to Duddly (now defunct but offered at the sims biker I believe) for the inspiration of his wardrobe-changing doors, Aenigma's site for the un-gapped door bases, and The Tom and his thorough knowledge of sims' programming code. Now we want to predict this system forwards and we’ll use the same criterion for failure: when some particle leaves a collision 90 degrees out from where we predict. Now we want to predict where the balls go, and we’ll say that the prediction fails when a ball leaves a collision 90 degrees from where we predicted - it’s obvious that after that point we can’t usefully predict anything.