PSA: Look At The Map
It's there for a reason. Use it. You can cuss, spit, bitch, suck your teeth and flame your teammates for you jumping in 1v5, 2v5 or 3v5, losing and then asking, "Team? Wtf are you doing?"; but at the end of the day the only one at fault is you. If your teammate is in a side lane clearing it before minions crash at the tower, they ARE doing something worth while. If you and your buddies take it upon yourselves to fight an uneven fight without everyone there thinking its in your best interest and you lose, that's on you and whoever follows you. People with brains wouldn't put themselves in compromising positions unless they though they could outplay the opposition. How about using your bra -- sorry, wrong topic. USE YOUR EYES PEOPLE.
YOU HAVE TWO OF THEM. Once you SEE a problem, you can come up with the correct SOLUTION for it. Stop jumping off a cliff without checking if there is water or a safety net at the bottom first.