Mark Worsfold, who has Parkinson's disease, was reportedly arrested before the Olympic men's cycling road race for not smiling enough.
Worsfold was arrested on July 28 for a "breach of the peace" before the cyclists arrived in Redhouse Park, Leatherhead, reports Guardian.co.uk.
In a statement, police said: "The man was positioned close to a small group of protesters and based on his manner, his state of dress and his proximity to the course, officers made an arrest to prevent a possible breach of the peace."
"There were a number of factors which led officers to make this arrest, including the fact that the race was rapidly approaching, the heightened level of security due to the high-profile nature of the event and the sheer number of spectators in attendance. These were fully explained to the individual concerned. He was given words of advice and released with no further action."
Worsfold claims that police questioned him about why he had not been visibly enjoying the event.
Worsfold, who suffers from muscle rigidity that affects his face due to Parkinson's disease, was released from jail after two hours.
He told Guardian.co.uk: "It could have been done better. I was arrested for not smiling. I have Parkinson's."