Tomatoes of unusual size

Is this normal? I planted these two tomato plants about a month ago and they are now freakishly large. I went outside to water them yesterday and was shocked and awed by how large they have become. I had to take a picture for posterity, with myself as a height comparison. These babies come up to my waist!


Our neighbor planted the same tomato seedlings in her front yard, and hers barely come up to my knee. Perhaps the soil in my backyard is extra nutritious from all the bamboo roots that are left over from the bamboo debacle? Perhaps it is my mad watering skills? In any case, I will probably be having tomato parties later in the summer to get rid of the bounty that these plants are sure to put forth. That is, if they don't take over our whole house, jumanji style, first.