Mason is not a little guy and from the look of his food choices, one would know that he is on his way to getting even bigger. He is still growing and ...look at him grow.
Sonic granted his request for this humungus hamburger. He just wanted to see if he could do it.
Looks like me when I eat one of Ron's single patty hamburgers with all the 'trimmings'. Yet I go back over and over for those.