Dragons and dinosaurs, including the correlation between the two.
Certain fictional characters where I get attached to their lives. It's probably why I prefer characters that manifest in multiple books or series.
Researching information sometimes leads to path after path which is only linked to the previous path and not the original interest. The fixation doesn't stop until I literally tear myself away. It can be both helpful and a complete waste of time if there's a deadline or goal involved.
I go through phases, current phase is boats. Reading about different types, watching them in the water, talking to people, going on them whenever I get the chance... to the point where I'm kind of itching to buy myself one, even a kinda junky little bit fixer-upper.
Before that it was ink printing.
Your kisses, sweeter than honey. But guess what, so is my money.
A man builds. A parasite asks 'Where is my share?'
A man creates. A parasite says, 'What will the neighbors think?'
A man invents. A parasite says, 'Watch out, or you might tread on the toes of God... '