Partial Obedience

Hey everyone ... we need some skit ideas.
What are some examples of things that would be bad if you left out some steps or only did them half way?
Like baking a cake but leaving out an ingredient.
Or working on your car but leaving a few pieces out.
Or building your kid's swingset but not following the instructions exactly.
What are some more ideas of where doing something "half-way" would ruin the whole thing?
Post your ideas.
Thanks