Why on gods green earth do people step over stuff on the stairs?

[Yellowleadbetter]

It’s there because it needs to go upstairs and as you are on your fucking way upstairs, fucking take it with you.
FFS.
It’s not rocket science, it’s simple, surely it’s simple?

My FIL does this, and it’s because he’s going upstairs for a reason, so why would he take things up because that’s not why he’s going there. Drives my MIL barmy.