The conversation between human and AI assistant.
Why do United fans hate Chelsea so much?
Have there been any other incidents that added fuel to the fire in this rivalry?
Yes, over the years, there have been many incidents that added to the rivalry. For example, in the 2008 Champions League final, Chelsea lost to Manchester United on penalties, which was a blow to Chelsea's chances of winning the title. Also, the transfer of Juan Mata from Chelsea to Manchester United didn't go down well with some Chelsea fans.