So first, once the bottom sheet is on, get on it and make sure it looks right...
Check the top sheet to make sure it matches....
Then check the underside of the top sheet to make sure it smells OK...
Then, before the top sheet is pulled over, make sure the bottom sheet is sufficiently taunt...
Usually at this point the humans throw you off the bed. That is too bad, 'cause if they would let you stay on it while they pull the top sheet over, you could do a complete inspection of the underside. Since this is usually not possible, a sample of the underside will have to do. So take that step seriously!PS See the post below to check out Lilly Lu's card!