I've encountered an odd problem while baking an 11"x15" sheetcake... one half is done and the other half is not! I'm concerned about placing it back in the oven and totally ruining it. I had two cake pans in my oven at the same time and this is what happened... should have known better. Anyway, should I just stick it back in for a few minutes and cross my fingers? The side that's not done probably needs another 5 minutes... maybe longer now that it's nearly cooled off. 
I'd try sticking it back in if it's not done. If the other side gets over-done you can use a simple syrup on it to moisten it up a bit. When baking more that one cake make sure if they are on different racks that they are directly above and below one another.
Deb
Cover the side that is done, with aluminum foil and put the cake back into a pre-heated oven and see what happens. The foil should stop the top of the cooked side from getting overdone.
Hugs Squirrelly
What would happen if I cut the cake in half and just put in the underbaked side for a few minutes? This will be a shaped cake, so I'll be cutting it up anyway? I'm guessing it will dry out a little on the exposed side, but I can just cut that part off... would this work?
It would depend on how much underbaked the one side is, for example is there a risk of the batter from the one side squishing out into the pan?
Your oven has hot spots, one side of the oven cooks faster than the other side. Your oven needs to be calibrated to correct temperature throughout the oven. Placed the uncooked side of cake on the side that cooks faster; I agree with squirrelly cakes to cover cooked side with aluminum foil.
Thanks ladies, I'll give it a shot! The undercooked side is almost done, but the other side is perfect. I've never had this happen before, but I think having the other cake beneath it somehow kept the heat from being evenly distributed. Had the other cake in a smaller pan on the rack just beneath the sheetcake. Next time when making a sheetcake, I'm going to bake one cake at a time. Takes longer, but then again considering the time I took trying to fix the problem... did it really save me time? 
Learning something new with every cake I make!
my answer would have been to cover the side that is done .... boy!! I've learned alot from this site
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