I have not tested a Mega, it should be the same but I am not sure. I used Windows 7. I noticed this behaviour the first time using a Visual Studio program but then I was able to replicate it in other terminal programs.
I believe that you have to open and close the port without using any flow control. When you open terminal, if you see "F0problem" it means that there was a reset.
If you don't see any problem maybe this happen only in Windows. This may be interesting. I have a Mega around, I will test it also.
F0 F0 F0 F0 are the same bytes that I get opening port in Windows without resettting Arduino.