This is a classic entertainment game usualy found in old community forums, in which you must write a word related with previous one
(a tille example: post 1: House > Roof; post 2: Roof > Rain; post 3: Rain > Water; post 4: Water > Fire; etc etc etc!)
It have few simple rules:
1- Don't broke any
Forum Rules;
2- Don't edit your post (in this case, the word will be related with the previous listed!);
3- Don't play again (you must wait atleast reply of two different people before reply again!);
4- Don't repeat a word already used in last 3 pages or the words of 1st page;
The starting word, it's obviusly:
e-Sim