Okay I searched this up there were similiar things but not exact so heres a shot at it!
-First you'll need a warlock and about 3 other people.
-Now go in outlands and find a huge cliff and get as close as possible to the edge.
-Next get 1 of your people to go in shattrath and say in trade channel "Free summons to outlands PST [your warlock]
-When you get the victim invite them into the group and start to summon them (make sure the summoning portal is a bit off the cliff)
-Now when they accept the summon they will fall all the way down and SPLAT bye byes
This is very dirty deeds indeed MUAHAHAHAAH
do not flame! (also make sure your warlock can summon)