In my first trimester I craved really acidic foods, like lemons and vinegar. I would suck the juice out of whole lemons and then eat them. It was so bad once that I went down to a cafe near where I worked and asked them for one of the lemons that they had in the bowl on display for decorative purposes. They gave it to me, thought it was strange and then told them I was pregnant and craving lemons. They still thought it was strange, but slightly less strange than before they knew I was pregnant.
I used to also drown my hot chips in vinegar. I always like vinegar, but I would drown them so much they went soggy and there was always a pool of vinegar left afterwards, which I would drink up. There were times where I would also take a swig out of the vinegar bottle.

Then during second trimester I craved Kiwi fruit. If it was a bit tart then it was better too.

During 3rd trimester it was chocolate covered strawberries, or just strawberries on their own. By that time I couldn't stand vinegar or other acidic foods as they gave me heartburn.