Sending just three emoji to an iOS device is the new comedy hack in town, as receiving the odd visual message combination can lock up iPhones so badly that they need a restart. If you hate someone enough to want to deprive them of a screen to look at for a few minutes, here you go.
There's a page outlining the emoji you need to paste in and send off via iMessage here -- it looks like it's the white flag, a circle thing and a rainbow. Something like that, I don't know, I use proper words and hardly ever talk to people anyway.
Alternatively, this code might work when copied and sent:
If you don't own an iPhone and aren't on banter terms with anyone who does, the finder of the crash bug has put together a YouTube video demonstrating it, so you can have all the fun of seeing Apple fans being mildly inconvenienced without having to actually engage with any. [YouTube]