With the rise of new malware and "scamming tools", always be on the watch so you don't get scammed.
This open sourced project: https://github.com/chester7/txgen
Generates malicious "valid" transactions and then broadcasts them to the Bitcoin network (of course they never confirm), but this still makes scamming with this method much easier for scammers.
There's also been on the rise malware that will steal your wallet.dat file, all your saved passwords. There's even malware out there that will stay idle until you type in your Bitcoin client's password, then "freeze" your computer while the program tries to steal all of your funds. Then in many cases, the malware will disappear completely from your computer as if you never got infected in the first place.
So all in all, just be safe by not being stupid.