During a science lesson at school me and my friends actually discussed this, well at least started discussing this. the convertation actually went over several weeks, we drew up plans, came up with ways to get the money we needed we even divided the world up into the parts each of us would own, we basicly did everything but actually take it over.
Step 1. Our plan was to get to get a brother and sister monkey and make them breed so the baby monkey would be inbread, then we would make them do it again so the monkey had an inbread sister, the the two inbread monkies would breed so their ofspring would be double inbread, ect ect. We would do this for a while untill we had 1million inbread monkies, thus completes step one.
Step 2. We would then infect a quarter of the monkies with a mutated form of chicken pox, it would be mutated so it didn't effect the monkies but only humans, plus if a human caught it then they would die in 4 hours (we used chicken pox becuase at the time one of my friends sister hd them.) after doing this we would unleash them on Washington DC, whipping out the presedent and most of the secret sevrice.
Step 3. In the 5th hour after contamnation we would go in wearing hazmat suits so we wernt infected and gain access to the launch codes for USA's nukes. Using the codes we would proceed to use them on every other major contry on Earth but we would put them on a 30 min delay giving us enough time to get to our underground vault like the ones in Fallout3 (thanks to our metal work teacher, we know how we would build it and thanks to the mexicans we would be able to build it).
Step 4. We wait out the nuclear holocaust in the vault with plenty to entertain us (E.g. the monkies) Once it is safe to go outside we will emerge from the vault and using our knowldge of all holocaust games we will astablish a city, get a computer system online and build a small army.
Step 5. we invade the Earth using our power and the threat of our monkies and/or virus. and after around 10 years the world is ours!
So if you ever hear of monkies attacking the white house then run as fast as you can to Alasca or Hawaii becuase those places will be safe houses, they will have vaults built aswell, the password will be "Yatzee you carazmatic stallion".
(P.S. the monkies were inbread for our own amusment, if they all died of retardism then we shall just use the mexicans once they're done making the vaults.)