After attending a few sporting events, I found that the best question to ask someone there is, "Who are you rooting for and why?" This question not only sparks a conversation but also gives an insight into the person's sports preferences, affiliations, loyalties, and their reasons behind it. It's a great ice-breaker and helps establish a connection with the person. It also opens up discussions about the game, players, and strategies. So, the next time you're at a sporting event, don't hesitate to ask this question.