Just tell them to go away... unless you see the suicide attempt or speak to the doctor after all.. a suicide attempt should in theory always end you up in a hosptial to where you normally spend a few days and don't normally go back to a normal lifestyle in less then 24 hours (i noticed that people claim to of tried killing themselves one night but appear the next day with some kind of poorly fitted bandage around their arms)
Just tell them to grow up and leave them be... its mostly all for attension... when people are going ot kill themselves they don't tend to tell others