Toddler mode.
A toddler doesn't care much about anything else but getting the thing it wants. And as soon as it gets it, it wants something else.
Most times when we get obsessed with an idea, or a project or a person, it's because that toddler part of us has somehow taken charge.
Once we see that, it may give us the agency to get out of the toddler mode and be the generous adult that we are.