Tom, 41, told Wales Online: “It was spectacular. I was driving through when I spotted the big brown splodge. A lot of people were really amazed by it, cars were slowing down and people were taking pictures of it.
“I was a little bit concerned, with it being in the middle of town outside a pub, that someone might do something stupid and get hurt or do something stupid and hurt the bees,” he said.
The woman who had the car the bees followed, Carol said: "It was incredible really. I've never seen anything like it - it just goes to show the power of nature. One theory was that the queen was trapped in my car and the swarm were following her.
"But they couldn't find the queen anywhere so I've no idea if that was right."
Apparently bees can swarm at this time of the year and it is a very strong instinct for them to follow the queen.
Roger Burns, of Pembrokeshire Beekeepers, said: "It is possible the queen had been attracted to something in the car - perhaps a sweet or food in the car.
"The swarm of around 20,000 had followed her and were sat around on the boot of the car.
"I brought over a cardboard box and carefully brushed them into there as quickly as possible as I was aware it was a big swarm in the middle of the high street.
"I got about 15 or 20 stings for my trouble.
"I then left the cardboard box on the roof while we waited for the last few hundred bees to leave the boot but then a gust of wind blew it off and the queen may have fled back to the boot again."
Credit: Mirror UK