A guy walks up the stairs

So this (dumb), guy (me), wakes up in the middle of the night. And he needs to use the bathroom downstairs. For the last few weeks he has been busy (off and on), refurbishing the rooms on the second floor, and because of that there's a very hard steel ladder in the middle of the staircase. The dumb guy manages to walk down the stairs without any problems. But then, a minute later, walking up the stairs, he has completely forgotten about that steel ladder.