Fill in the Blank (a joke)

 

Once a person was shown a hell. There were various fire pits. He observed that there were guards at each pit, except one. Where there was no custodian. He asked the organizers. Why it is so? He said that all the people inside the pit help others if anyone tries to get out of it. So a custodian is appointed to stop them. But people of that pit are totally different. We will show you what is going on in that pit.

When he got there, he saw that when anyone tried to get out, the others would pull his legs. He said that this is the pit of ……. No need to appoint a guard, no one can see anyone coming out and pulls his legs by himself.