Yup, if your brain gets caught in a feedback loop of "this makes me happy" and "being happy stimulated means we can continue doing this" you can do the fun stuf

Yup, if your brain gets caught in a feedback loop of "this makes me happy" and "being happy stimulated means we can continue doing this" you can do the fun stuff for hours without a break and disregarding anything that happens around. Boring (in a non-judgemental sense - plain) tasks very rarely trigger it. You can kinda cheat though by adopting a new exciting system for doing X to achieve X. (You'll likely abandon the system shortly after...)