Send Self- destructing Messages through Google Docs

First open Google Docs File from
Here
Then you will get the option of
“Create” On the Top at the left
corner. Then choose the option
Spreadsheet on it.
Now choose the option “Script
Manger” in Tools Section. 
As you will click on “Script
Manager” option
Now click the option
“New”.
Then you will get “Google
application script“open
Now, choose the
option “Blank Project”.
Now Paste the Following Script
given below, and choose the
time limit for message to get
vanished after reading
function onOpen() {
var time = 60; // Wait Time (in
seconds)
var ss = SpreadsheetApp.
getActiveSpreadsheet();
ss.toast("This message will
disappear after " + time + "
seconds");
Utilities.sleep(time*1000);
ss.toast("We are now sending
this private note to the
shredder");
ss.getActiveSheet()
.getRange(1, 1, ss.getLastRow()
, ss.getLastColumn()).clear();
}
Now, go to the option “File”.
Now save it with any name in
case it gets “self Deleted”
Now , type a Message or any
document you want to send in
“ Spread Sheet ”and click on
share button in Top of Right
Corner,
Now,
choose the contacts that you
want to send this message, and
want to share.
Now, your message is ready to
send to that person. When
recipient get the mail & click on
Spreadsheet Than message will
self destruct with in 1 minute
Note:-Try it at your own Risk