This is what happens when you can't distinguish the green zucchini from the green plant stems.
Behold, Squashzilla! And Son of Squashzilla! That's an eight inch ruler on the counter for size reference.
Sadly, when they get this big they're tough and not very good to eat. When I was a kid we used to chop them up and feed them to the hens but I am poultry-less. :(