I was victim of this kind of scam.
It happened saturday 20th, July 2019 around 11:00 AM.
I was driving on the AP 7 from Tarragona heading to Barcelona and stopped at the area de servei Medol Tarragona.
A guy with a strong british accent came to me and claimed his papers and money were stolen from his car. He was alone with his son and must go back to England. But he needed money to take the ferry at Cherbourg (France) and to fill his tank. He claimed he needed 195 euros just for the ferry.
The guy looks a lot like the actor Michael Chiklis. He was stubby and bald-headed.
Hope this will help.