Factual error: In the scene where Micky and Howard are discussing Livia's parking ticket, Micky mentioned that date the ticket was issued was September 5th, a Thursday. The movie takes place in 2003 where September 5th was a Friday.
Factual error: When the Russian tears the toilet up to throw it at Frank, the room should be awash.
Answer: In Season 9, Episode 20 of "Mythbusters," Adam and Jamie tested whether a person could survive a "toilet bomb" (recreating a Lethal Weapon 2 scene) by jumping into a cast iron bathtub and being covered with a bomb blanket. They used 1 kg of C-4 explosives that created a blast with a peak lethal pressure of 180 psi outside the tub. The pressure inside the tub was recorded as a survivable 8 psi, though with probable hearing damage. From what I read, a grenade has a much lesser psi force than what the C-4 explosion produced. Depending on the circumstances, it seems plausible that a person could survive the force and shrapnel while inside the tub.
raywest ★