Where do you get the rotten egg on Resident Evil 5

I have just found one in chapter 5:3. It didn't work the first time, but i found it early on second time round when I was searching for the BSAA emblems. If you want the trophy, remember that you only get it once all 4 types of eggs are in your inventory. Hope this helps!
(Guy that asked the question[me]) Thanks a ton, I'll try it when I get home.