Fantatastic Lemonade

Alright, listen up, smarty pants. The joke is a pun. "Fantastic" is a word we use to describe somethin' great. But the punchline says "Fantatastic," which is like "Fanta," a type of soda, mixed with the word "fantastic." See, it's funny 'cause lemonade is a drink, and Fanta is a drink. You probably think water is a food, ya dingus!