Murphy on Painting: Law #1

If you are using an obnoxiously sticky, stinky, oil-based adhesive primer to start the repainting job to a custom-built closet shelf, whose horrid dark mahogany tint hasn't been painted in about 40 years, your brush will through a rather large drip across the length of said closet to land perfectly on the spot of carpet where your activities just happened to pull the drop-cloth out of position.