An idea for http://omg2.thedailywtf.com/

flipper.c

#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>

void sig_handler(int sig) {exit(0);};
	
int main ()  {
  signal(SIGTERM,sig_handler);	
  pid_t pid_v;
  char* result = "heads\0tails"; 	
  pid_v=fork();
  if(!pid_v) {
	  pid_v=getppid();
	  result+=6;
  }
  srandom(pid_v);
  
  usleep(random() &0xffff);

  kill(pid_v,SIGTERM);
  
  puts(result);
}