Programming style, uppercase

I heard that writing variable names in upper case is bad. Is there a real motivation or is just a convention?

Tangential question!

Most people agree that when creating pointers as variables, the clearest syntax is as follows _{^{(Warning: I'll be using shitCase, since that is my preferred capitalization style at the moment)}}:

ClassName *objectName;

...but what about in a class method definition?

ExoticType *ClassName::methodName(int argOne, int *argTwo)
{
//...

or

ExoticType* ClassName::methodName(int argOne, int *argTwo)
{
//...

?