There have been times where there was some sort of almost immediate connectedness, but it came through in an exchange of consversation versus chemistry. On the other hand, there are three different times in my life that I was near two people that exuded what I can only describe as an overpowering wave of pheromones. In all three cases, none of the people involved were displaying any type of physical evidence that they were attracted to each other. In all three cases, it turns out that they were.