Speaking of 4v5, here is a true one...
Corki afked from the very start of the game, which really scared me as I tend to react really badly towards 4v5s. However, I looked at the champ I'm currently playing, my lane match up. Diana is such a strong snowballer that I didn't give up hope.
Things started pretty okay. Their Blitz was afk for the first 3 mins of the game and our Blitz got first blood on their Ashe (lol). I had no problems farming up against Ryze and he ran out of health pots and mana pretty fast. Kayle up top got camped by Rammus and died to Riven.
Lv.5 I started to roam around and got myself a kill on Ashe, then smashed Ryze at 6, then Riven, then Ryze again before dying to Rammus. Got myself a good couple of items.
Midgame rolled and I got caught roaming by Blitz/Ryze/Ashe but I was pretty fed at that point I could 1v3 them, get a triple kill, and come out alive. But Riven came so I died T_T.
At this point I realized we could take them on very easily and forced a teamfight near Dragon which we won with an ace at the cost of my life. Kayle got a triple kill rofl. Got inhib and then a second one later which allowed us a very safe baron (well...nothing is safe with ashe arrow), and then we rolled over their base.
Meh.