Quick! Click the Back Arrow. Click the Back Arrow!
No... It's gone. Your carefully crafted entry. Gone...
[Cue the Big "NO!"]
Congratulations! Your entry has just been eaten by the Electron-Eating Data Vampires from Dimension Q. They are strange, intangible creatures who lurk on wiki pages and forum boards waiting for some hapless fool to write full entries into text fields from scratch. Save yourself the frustration and do the smart thing: write out the entry into some kind of text-editing program and then copy and paste it whole cloth into the forum or wiki entry's text field.
Thanks to TV Tropes' wiki-editing time limit, most folk who write long entries will go through the trouble of composing and saving them elsewhere. But occasionally, someone somewhere will view an existing trope, think of a quick example they can add, think up the most clever commentary ever written while entering their example into the text field, and press the send button, only to have the Data Vampires snap up their precious writing like a pack of starving hounds snapping up a sausage-covered kitten. It's brutal. It's unpredictable. It's unfair. It's... life...
A quicker way to safeguard your edit is to highlight it, right-click it/go to the "Edit" menu, and select Copy, just before you hit "Send."note Therefore, if anything goes wrong, you've still got a copy of it. Of course, you need to paste it somewhere pretty quickly, lest you forget and copy something else.
There are also some browser add-ons, such as TextAreaCache, that will save text you enter into text inputs for a short while, allowing you to recover it if there's some sort of error.
A similar thing happens in quite a bit of internet forums: most session cookies have an expiration time, so if you spend more than that time writing a big Wall of Text and then click the Send button, your post will be sent from an expired session, and therefore, it will be eaten by the Data Vampires as well. This can be usually prevented by selecting the "Remember Password" option when you sign in, which sometimes makes the cookie last forever.
The epic battle against the Data Vampires, known to history as The Great Crash, must never be forgotten.
However, it is not unknown, and not uncommon, for people to be gifted with the power to pry their entries from the jaws of a Data Vampire before it is swallowed whole. More often than not, it can be retrieved and sent by, rather than pressing the back button, hitting
F5 whatever key sequence your browser uses for reload. Refreshing works miracles. (Unless the Data Vampires make it so the Database Hates You, in which case you're roundly screwed.)
Also, if you have Firefox, the back button is even more powerful, as the program will often save your data. (If that doesn't work, a memory dump should.) Opera does something similar, and should always allow you to recover stuff via the back button. On the other hand, there are some minor rumors that Internet Explorer's "Back"-button is either sponsored by the Data Vampires or is one itself...