Input tokens are cheap. Output tokens are the thing that really costs money. There is a Claude extension called caveman that tries to save tokens by making it use shorter sentences with less words. So if you want to waste money, do the opposite - ask it to use lengthy sentences with as much words as possible.

Also - some words amount to multiple tokens. I don't know what the rules are exactly, but I'm assuming that more complex and uncommon words are worth more tokens - and thus waste more money.