Here you have an oral activity called "anecdotes bluff". You can cut the topics and students can pick random cards with those topics. Or even, for lower levels, you can project on the wall so students can choose the topic they want.
Once the student has his/her topic chosen, he /she has to speak about that topic and tell a story (true or false).
In the end, the classmates have to guess whether the story was true or invented.
In the pdf, you can also find useful vocabulary o use.