You call in sick to work to buy more screws and trim.(then run into your production supervisor at Menards, true story, never have asked what he was doing there).
You buy parts for "the next one" before the first one is done.
Your decision on taking a new job hinges on how long it will delay the start of "the next one".
While driving on a rural gravel road you drive around the section because you thought you saw something teardrop shaped in a grove
You spend half an hour walking thru a grove because someone said there was a TD in there only to find an old rusty frame and a pile of what used to be plywood.
When people ask you "Your'e building WHAT?"
You look at a box of old exhaust valves and think "Those would make neat cabinet handles for THE NEXT ONE"