Like burying landmines!
Several of my beds went totally crazy with weeds last fall and this spring, some because of top dressing with weedy compost, and some because they had perennials that kept me from just chopping away with a hoe, and some because I procrastinated (see Procrastinators microbadge, charter holder!).
With those beds, I really don't think I can make them much worse. This fall and next year they'll be test beds for whether or not enough mulch can protect soil that's like 10% weed seeds!