Always, always keep your source files safe!

Too often I see designers/salesdude who come for a presentation pitch end up not removing their files from my laptop.

Also, for presentation, they didn't organize their files well. So they just copy the ENTIRE work folder into my PC. Meaning their psd, ai, fla, dir files are just 'given' to the client. How to cari makan like that!? End up I have to remind them about it.

Well, this is not exactly on-topic. But I think this will be a good reminder for all.

Some things that comes to mind:
1. Never, ever give out your source files until you get paid.
2. Have a proper and organized folder for presentation that does not contain your source files. Sometimes you'll have to copy the file to the client's computer and you'll end up forgetting to delete it after presentation. Voila. Free source files that they can forward to 'cheaper' designers to complete the job.

Oh ya. Designers. Have to learn how to convey your ideas better and have good presentation skills. That means, you need to have a confident command of English. Else career advancement would be rather limited and you'll always end up as the FA (Final Artwork) dude. And that's very close to the bottom of a department's hierarchy.