My ex wasn't big on following instructions regarding kid maintenance...he had to learn from experience.
He decided to change our infant son's diaper. He put son on OUR bed, with nothing (not even a fresh diaper) underneath. He gets the diaper off and tosses it to the pail. Meantime the fountain of youth starts up...so he throws the fresh diaper on top of son. Then the "solid" waste starts emerging (remember this is on OUR bed). He tries to stop it with his hand....parents of breast-fed babies will know what I mean when I say that was completely futile. I hear him hollering for me and I come in to find him holding the diaper on top, his other hand full to overflowing with liquid poop...
Fortunately nothing made it through to the mattress, but everything (including son) had to be thoroughly washed.

And lest you think that permanently excused him from changing diapers...nope. But he DID learn to use the changing pads after that.