Please help me, i really need help?

I have been assigned to do a speech based on my topic of choice.
However the other day i decided to do it on KKK and my teacher said
that was not appropriate as everyone did not know what KKK means
Inappropriate topics include Drink Driving ( The school is 12 and 13
year olds no one drives)
So i need a topic that can relate to everyone

If you have an idea please post it below
Also an introduction would be nice