How to make comeback plays

http://www.youtube.com/watch?v=po0roSjbtWw

We'e down 7k gold, enemy team is fed and we've lost most of our turrets. The enemy team has baron and we have to hold them off 4v5 because our top laner is tilted and won't be coming to help.

I'm sure many of you have found yourselves in this situation and felt hopeless. Fortunately there are ways to overcome the odds by squeezing out every bit of power that you can by coordinating your abilities with complete strangers in solo queue. This is an example of such a comeback strategy involving Jarvan + Gangplank

While the particular abilities used here are specific to this Jarvan/GP synergy there are other combo's out there with much more damage/efficiency potential to shape the outcome of a team fight. Hopefully this gives you an idea that you can use to come up with your own creative plays.