I find my internal monologue too often saying: "At XX:(00, 15, 30, 45), I will start doing Y". Then I get lost in my procrastination and by the time I notice the previously selected time had passed, so too have a handful more minutes. Even though I said at 9:30 I would take a shower, it's no longer 9:30, it's 9:37, and that's almost 9:45. If it's almost 9:45 then really I could should just keep procrastinating until then, since it's a nice, round number, and who lives by ugly, non-round numbers? Sickos!

This is worse for very undesirable tasks. I remember once in high school where a whole night had been wasted by this ceiling-rounding, because I desperately did not want to make those slides for that presentation I wanted to do even less. I've gotten better over the years, but still find myself falling into this trap.