The 55-year-old "Love Actually" star said the incident was illogical but it made him cry for three consecutive weeks, reported Hello! magazine.
"I got on the plane to go home, open a newspaper reading the football results - and burst into tears. And I couldn't stop crying for three weeks. It was completely absurd.
"I'd go to a cafe and they'd say, 'You want skimmed milk or regular?' and I'd burst into tears. So I went to see shrinks then," Grant said.
The actor also revealed he was in Maldives just before that incident, where he had about 30 massages a day out of extreme boredom- "I went mad in 2007. I got massaged into madness.