Just so no one is left out on the fun... if you are on another type of machine that does not have MS Paint, I'll try to find some alternatives....
Older macs may still have a copy of "MacPaint", which I believe preceded MsPaint, but was left out later for third party developers to fill in the gap.
"Paintbrush" is a free version of a similar program to MsPaint. It can be found here: http://paintbrush.sourceforge.net/
It does not have the little lasso tool though, so that makes drawing even more difficult, ahem, I mean challenging.
There are others out there too, try searching on the main apple page, "softpedia", etc.
I see there are some online versions of Paint. I had a hard time with www.canvaspaint.org
, seems like it was optimized for older browsers...
If anyone comes across any, please post about it here, I'll keep looking.