All shares are risky and volitile really but thats why you can make good money from it, risk vs rewards and all that. Just dont have all your eggs in one basket or use money you cant lose and just shrug about. Iwantmore has the right idea there. All shares can become worthless, the major banks did, Railtrack did, HMV, Game, YellowPages, going back a bit Marconi... BP virtually halved after that gulf of Mexico spill, I could go on but you get the idea, nothing is "safe".
I am still waiting for either RKH or BPTY to bounce/ rerate so I have a bit more stake money... Until then I am staying out.