Explaining a joke really kills the spontaneity, but if you don't get it then I guess it wasn't really a joke was it??? Here goes...
After seeing the spider, he said "There WENT my breakfast." Referring to the enormous size and girth of the critter, and thus the assumed "meat" that could be derived from the aforementioned critter, I say...."There GOES my breakfast" Then keeping the "size/meat" reference alive, I'm inferring there is more than just breakfast.....there is enough for lunch, dinner, etc. I sum my point up with a visual that most people are familiar with and reference a bucket of Kentucky Fried Chicken.
Capiche?