To add drama to a situation. It could be in a really boring place like Yates with your 'friends' when something really uneventful happens or maybe when you're online and your ex starts talking to you all of a sudden.
*group of friends are sitting around a table and a waitress comes over to collect empty plates. Waitress struggles and almost drops the plates*
*someone accidentily goes on facebook chat and clicks online to their 'people I don't want to talk to' group.. 2 seconds later an ex pops up typing your name in capitals*
Crazy ex: BOB!!