Ignore students who shout out 'sex' or 'kissing' or other unworkable topics.
The other students then ask the experts questions and the experts answer them. Each expert uses only one word at a time.
They are experts about fashion.
Question: What colour will be fashionable next year?
Expert 1: I
Expert 2: think
Expert 3: that
Expert 1: blue
Expert 2: will
Expert 3: not (Expert 3 trying to hijack the answer - this is good!)
Expert 1: be
Expert: 2: unfashionable (Expert 2 trying to hijack the answer back)
A very simple and effective speaking activity which the rest of the class enjoys listening to. An important consideration.