[Claymores]

At the Imtermediate Treatment Project I used to volunteer at (teens referred by Social Services for various issies) we'd tell them how to do it properly to spook-out attention seekers/bull****ters. 'Don't put a knife across your wrist as you'll only damage the tendons and sever a vein at best and it'll look stupid. Clench fist, stab a long bladed knife deep into middle of forearm and pull it to the fist - that'll sever the arteries and you'll bleed to death quickly'

Better off gone if genuinely mean it that putting silly cross scars on your body that gonna see for the next 50 years.

No sproglet ever carried thru to my knowledge