we had some scarily loud squibs on a shoot once.
There's fake blood you can get that looks good, you get it from fancy dress/"party shops". Dunno what it's called, and i've lost touch with the makeup girl who recommended it.
small squibs and condoms/balloons with fake blood in them is all you need.
i really wouldn't recommend real blood, that's manky and pretty dangerous.
AMD Athlon 1700 (@2200mhz from 1466 sod the noise!) - 768mb pc3200 - 200GB Maxtor - Pioneer 106 - GF4 Ti4200 - twinhan/visionplus pci dvb-t - random pci analogue tv tuner - A7v600-x (to replace the a7n8x-d that died...) - random 17\" CRT
Sony STR-DE425 & Eltax c205s;
xBox w/20GB HDD- executer 2.3b;
xBox - standard;
Konica/Minolta dimage z10 w/2x512mb SD;
A silly amount of Cat-5 and usb cables