Colin was not allowed to stay in the sun and get a tan for his role of Merlin in Merlin. He also had to wear sunblock factor 50.
A great deal of money was spent to make fake fruit to throw at him in Merlin. However, it looked way too fake so in the end they just went with rotten tomatoes, which exploded nicely. Fake cream was applied to his face and hair in those scenes where he had to be depicted pelted with them.