I've always worried about that. I can't imagine having my wife come home and finding my dead body on a bench with a bar across my neck. I've benched well over 400lb at home completely alone, but I have metal sawhorses that I use as racks. I've dumped 400 on them and never had a problem.
Raw gym PR's, soon to be broken-
Squat- 465 (405x3)
Bench- 345 (315x2)