Venom - 1981 - 6/10

Decent thriller (NOT a Horror film) with a powerhouse cast.
London kidnappers set sights on a young boy while his wealthy parents are traveling.
The boy is a pet enthusiast, and the day of the snatch, he brings home a new snake.
Unfortunately, the shoppe mixes his order and he brings home a Mamba, which escapes.
At which point, the caper begins to sour.
During filming, Klaus Kinski and Oliver Reed supposedly hated each other on sight.
Plot itself = bad guys, hostages, determined copper, and one pissed off snake (no CGI, it was an actual mamba, borrowed from the London zoo!).