You can have fun too. For example, developers often phrase their use-cases from the implementation perspective rather than from the actor's perspective. So when they write "Lend a Book" as the name of their Use Case, you can get them to actually try it. Pretend your inside a library, give them a book, and ask them to role play their use case. Like this... (the headband stops their arms from aching)
At which point someone role playing a Librarian can react like this...
...which makes everyone realize they should really have written this: