This activity involves a little prep work, but it can be really engaging for students, and creates a lot of discussion.
Basically, you survey other teachers at your school using a Dating Service type survey, and then students work in small groups to match the results into couples. The students must discuss the pros and cons of setting these various people up with each other, and it creates a lot of interesting and creative discussion. Students don't know who the teachers are, and you can even neglect to tell them that the people are even teachers at your school until part of the way through the activity.
The attached file includes the survey itself, but also the dating profiles that resulted from the activity I did. If you find it difficult to acquire survey responses from teachers at your school you could just use the completed profiles that we used. It would be far better to use actual teachers at your school, as I imagine this brings a lot more engagement, and also lets you have students guess who the profiles represent at the end of the activity.
After students discuss in groups and make matches of the profiles, ask groups to share their matches and post them on the board. After this, you can have students guess who each profile is, and then reveal the true identities of the people.
* Another option would be to create dating profiles based on famous people, and not telling students who the famous people are while they are working on matching people.