Someone gave me a body wash/shampoo combo as a gift and when I happened to run out of my regular body wash and shampoo I started using the gift stuff. So yes I guess I do use body wash as shampoo. Its not that bad really.
That's not that weird at all. Most mens bodywashes say on the bottle that they're suitable for the hair as well. Personally, I don't use them for that, just because I have long hair and it would get really frazzled.
when my hair was very short (a pixie), I'd use bar soap on it. It made this one friend of mine nuts because she's a hairdresser- she freaked out about pH balance and whatever. She bought me shampoo and conditioner and would actually check the levels to see if I was using it. Now my hair is longer, though, and bar soap would make it look crazy. (Otherwise I would still use it on my head.)