Alert McDonalds staff contacted police after serving a customer in the drive-thru they suspected was drunk.
Mariusz Jedrzejczyk of Cannock Road, Wolverhampton, admitted a charge of drink-driving after police found he was twice over the drink-drive limit at 3am.
Jedrzejczyk went to the McDonalds drive-thru in Bridge End Road, Grantham. He was then followed by an unmarked police car and stopped in Houghton Road, Grantham.
Bill Fraser, defending, said: “It is his first conviction and he fully co-operated with police.”
Jedrzejczyk was banned from driving for 20 months and fined £200. He must also pay £85 costs and a £20 surcharge.