I pulled up the specs on the .40 Glock Plaxico Burress was carrying when he shot himself in the leg recently. If you scan the specs to the last piece of information, it explains everything.
Plax is so used to double coverage, he figured 3 safeties was the best way to defend himself.
He was too good even for that.
GLOCK 27 Specifications
Caliber .40 S&W
Action Safe Action (constant double action mode)
Overall length (slide) 6.29 in. (160 mm)
Height, including magazine 4.17 in. (106 mm)
Width 1.18 in. (30 mm)
Barrel length 3.46 in. (88 mm)
Sight radius 5.43 in. (138 mm)
Rifling Hexagonal profile with right-hand twist of one turn in 9.84 in. (250 mm)
Weight, without magazine 19.75 oz. (560 g)
Weight, empty magazine 1.98 oz. (56 g)
Weight, full magazine ~6.35 oz. (~180 g)
Magazine capacity 9 rounds
Standard trigger pull ~5.5 lbs. (~2.5 kg)
Trigger pull length 0.5 in. (12.5 mm)
Number of safeties 3