A Mr Whippy was pulled over by police for driving without an MOT.
Sussex Police tweeted about the incident in Crawley.
The force tweeted: "Stop me & buy one! We asked him for an MOT certificate, not a Mini Milk & a Fab. Had plenty of ice cream but no MOT."
A Sussex Police spokeswoman said: "At 9.40am on Wednesday in Ifield Drive, Crawley, a 25-year-old man was reported for using a vehicle without a test certificate - MOT expired in February.
"The driver, a 25-year-old mam from Crawley, could face a £100 fine."