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Any contacts with representatives of alien life are extremely dangerous — ufologists according to whom, newcomers can kill you aren't tired to warn even without having the corresponding intention, that is — is casual.
"Spaceships of aliens which are often observed by inhabitants of Earth represent danger even when strangers have no obvious intentions to do much harm to you. That is, the UFO can kill easily you, for example, with the electromagnetic radiation" — experts say.
In some cases aliens begin to show aggression in response to quite friendly gestures. It is known, for example, of residents of Brazil who welcomed the UFO waves of hands, and newcomers have opened in reply fire with some lethal laser weapon.
Besides, the alien ships can make also some very strange radiation causing in people multiple unpleasant and even frankly dangerous symptoms.
"The headache, nausea, loss of sight, a hair loss and teeth and also the mass of other unpleasant things — all this in a varying degree often fix at themselves people who saw the UFO" — ufologists add.