Soda, for sure. Anything fizzy gives me gas problems, so I gave it up about six months ago. But I love Coke, and I love ginger ale even more. Being pregnant, I fight with myself almost daily ... I just really, really, REALLY want a ginger ale. I think I'm about to cave and just deal with the gas.
I also say "eff it" sometimes and have a few Doritos or potato chips.
I pretty much have diarrhea no matter what I eat, so sometimes it's just a matter of accepting that it's going to be a little grosser than usual if there's something bad that I feel like eating.