A terminally ill man who bared his behind to a speed camera van said he was "gobsmacked" to be arrested at home.
Darrell Meekcom, who was recently told he had multiple system atrophy, exposed himself at the van in Kidderminster, Worcestershire, on Friday.
He said he was forced to the ground during his arrest later the same day.
West Mercia Police said a 55-year-old was arrested on suspicion of indecent exposure and dangerous driving.
Wheelchair user Mr Meekcom, who also has heart disease, kidney failure and Parkinson's Disease, said after his diagnosis he came up with a so-called bucket list of things he wanted to do before he died.
He decided to target the speed camera van on Stourbridge Road in his home town after he had been "caught by them a couple of times for silly speeds like 35mph in a 30 zone and it always bugged me".
"I didn't think anything of it," said the father of two, who added: "It was a good laugh."
However, the response took him by surprise.
"I was simply gobsmacked that I got arrested for mooning a speed camera," he said.
He said about six officers arrived at his home a short time later asking to be let in and when he refused, his garden gate was kicked in and the officers got him to the ground to cuff him.
He said his wife filmed the "frightening" incident during which Mr Meekcom told the officers he was terminally ill and would struggle to breathe. He said he also suffered a blow to the head.
"I did not resist arrest once and I felt the response was completely disproportionate in the circumstances," he said.
Mr Meekcom, who felt unwell and went to hospital after his release from custody, said he has reported the incident to the Independent Office for Police Conduct.
West Mercia Police said officers received a report of indecent exposure on Stourbridge Road at about 13:00 GMT on 5 November and attended a property in Coley Close with the intention of speaking to an individual regarding the incident.
The force said on arrival officers attempted to speak to a man, however the situation developed which led to his subsequent arrest on suspicion of indecent exposure and dangerous driving.
Local area commander Supt Mark Colquhoun, said: "We appreciate the footage and commentary circulating around the incident has caused some concern.
"The incident was reviewed at the time and, after consideration of the full facts and circumstances, including reviewing officers' body-worn video, I am satisfied that appropriate action was taken by officers.
"The incident lasted around 38 minutes from the time of arrival at the address and therefore lasted significantly longer than the footage already in the media."
A 55-year-old man from Kidderminster arrested during the incident had since been released on bail, he added.