Here's the solution for each scrambled word:
1. Will Smith makes me laugh. I think he's really funny. (nufyn -> funny)
2. What a boring story – nothing happens! (ginbro -> boring)
3. This article about the history of cartoons is quite interesting. (letgintesnr -> interesting)
4. The programme is a very serious drama about the war. (resuosi -> serious)
5. I hate reality shows. I think they are stupid. (pusdit -> stupid)