A strong candidate for the most USELESS BB exercise is the DECLINE BB bench press.
Who in the hell wants to develop their lower pecs??!
In addition, it can be DEADLY to attempt max. poundage decline BB BP's unassisted!! Why, one top powerlifter in the 80's (I believe) was found dead...pinned under a 440 lb. BB in the decline BP position. At least, if you are doing unassisted flat BP's and get stuck, you can drop one side of the loaded bar to the floor, and roll the bar down to your waist/hip area and sit up and remove the bar. However, with the decline BP you end up with the bar "stuck" across your throat!
These BB BP common sense "safety comments" apply only to the legions of weight-trainers who train ALONE in home gyms w/o a power rack.