This one's fun & easy!
Post a sentence:
I love pizza.
The next person has to start his/her sentence with the last word of the previous sentence:
Pizza is to die for.
So, the next sentence must start with for:
For goodness sake, who is screaming?
The next person to post will have to start his/her sentence with screaming.
See? Not so hard, is it? :)
I'll start us off ...
I love sunny days at the beach.