There is an interesting program on BBC Horizon which explores how seemingly irrelevant externalities affect our decision making process. You can see the video here: How to Make Better Decisions
One of the experiments shown on the program indicated that you will feel more positive about a newly met person if you're holding a warm beverage. Conversely if you're holding a cold beverage you will feel more negative about that person. (Does it also imply a website?) This resonated with me as I just went through a hiring process and have been very dissatisfied with the person selected. If we had been drinking Red Bull instead of coffee would we have come to a different decision?