:-) Mr. / Mrs.
I give the beginning of a sentence ... other people will write the ending of this sentence.
Every user will see all entries of these other people in a tabelview / listview ... should be funny.
In this tableview / listview we will also see the nickname / username and maybe the location of the user if it is allowed by him.
All entries are stored online in a database (e.g. sqlite or mysql).
Everybody who wants to complete a sentence have to login (e-Mail - optional, nickname or username, password).