You can totally use emojis as passwords. You can probably even make this a policy at your company.
Edit: I thought this was an obvious enough joke, but just to clear things up: Only do this if you hate your company and everyone working there.
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Afaik, emoticons...er....sorry, emojis are (mostly) dictionary words. And using most (if not all) as passwords is a one-way ticket to "wtf happened to my work PC and why my boss wants to kill me"-land.
Edit: I thought this was an obvious enough joke towards your obvious enough joke -- just "outjoking" your joke. :^)
Emojis are interpreted and stored as Unicode codes like U+1F6D2. Sometimes you might be able to do something like :bed: but those are more for human convenience and up to the individual application to handle or not, when it gets stored it'll be converted to its corresponding Unicode
A series of emojis, once made into their Unicode would actually serve as a fairly decent password, if it's of sufficient length.
The irony is if it was actually stored as dictionary words it would actually end up being a very secure password, see