Calvin imagines himself to be a hummingbird who needs a constant supply of sugar to maintain his hectic wing flapping. He consumes half his body weight in sugar water a day. In reality, he's taking some fizzy drinks from the fridge, which is augmented with caffeine.
https://cdn.mastodon.org.uk/media_attachments/files/112/947/982/329/629/274/original/912bf9e8cd142452.gif