met some people who have been stabbed, they recon they didnt realise right away so there doesn't seam to be that bigger point in doing it - also if people find out u stabbed their mate they will wanna get u back
if ur really scared then pepper spray could be an idea - as u can spray security guards also if you wanna, ive though about taking a dog with me but that seams to be a whole nother kettle of fish thats not really worth dealing with
basically man the fuck up