Players are bad. They throw dice at DMs. They eat all the Doritos before you even get any then rub the ornage cheese-powder/grease all over your books. They rarely chip in for pizza. They drink all the Mountain Dew, promising to bring some next session, but always have an excuse for why they didn't bring any... as they go to the fridge and get more of your Mountain Dew! They use your bathroom and never lift up the seat. They spill drinks on all of your rare first edition game books. They draw on your battlemat with the dry erase markers that never come off. They "borrow" your books and you never see them again. They hit on your little sister. They compare themselves to snowflakes. They only like character concepts that are outrageously overpowered. They cheat on all their die rolls. They complain about your adventures but don't say how to improve them. They complain about you using the same CD for ambient music, but never ofer to bring/buy a new CD.
If your players are like this, use 4 Pit Fiends. If not, try and find a challenge more in line with their levels and abilities.