Saw hundreds of these this past weekend, we don't have anything like this at home.
Most were little and up to the size of an apple...this one was the size of a dodge ball.
And lots of them had been gnawed on by some bug or little critter that must be immune.
You can eat those if you boil the drugs out first. I have eaten plent of them. They are also a good indicator of conditions favorable to porcini. I usually find fly agaric near porcini mushrooms growing among spruce trees.