Using sounds in DayZ that everyone can hear within 80m and screwing around lastnight.
http://www.youtube.com/watch?v=TMKW_CppTDU&feature=player_detailpage#t=235s to jump directly to final action.
Especially sounds from this video: http://www.youtube.com/watch?v=fPK0Szuhz1I
"DayZ - Scaring People" video also worked as inspiration: http://www.youtube.com/watch?v=suEj5dTEgDE
