Ill start off some...
good idea:Feeding stray kittens in the park.
bad idea: Feeding stray kittens in the park, to a bear.
Good idea: Taking a deep breath before jumping into a swimming pool.
Bad Idea : Taking a deep breath after jumping into a swimming pool.
Good idea:Whistling while you work.
Bad Idea :Whistling while you eat.
Good idea:Ordering a chili dog to go.
Bad idea :Ordering a chili dog that makes you go.
Good idea:Climbing a mountain.
Bad idea :Climbing a mountain lion.