When I saw this video of the Tonight Show Starring Jimmy Fallon, I thought it would make a great speaking activity. Here's how you do it:
You divide the students into groups and ask everyone to write down two confessions. One of them should be something interesting that actually happened to them, and the other should be a lie. Someone from the group starts by reading one of their confessions. The other group members have 60 seconds (you can of course give more time if necessary) to interrogate the confessor. When the time is up, they have to guess whether s/he is lying or telling the truth. The group members take one turn each. If the students find the confession interesting, they can ask more questions after they have made their guesses.
Originally published on Tech-savvy English.