Is there a way and safe way around of having 2 mac OS on the Hard disk, so I can test and play with Both OSes so I can have Tiger or something Else OS and a leopard to play and what is the best way using Bootcamp or using Parallels or what?

I believe it's possible with multiple partitions on the main disk, with different OS X installations on each partition.

The Startup control panel should let you pick which OS X version to boot into.

How to share a user folder between the two OS versions without something getting mucked up however I'm not sure on.

I thnk you'll find BC is only for running 'FAT' based operating system. s Parallels is probably better as it allows you to have the operating systems running simultaneously. Can't see any reason why you could not have a virtual OS X in the same way you would have a virtual WIndows, or Linux or...

Surely you just partition your drive, or add another... Boot off the install disk and install another OS on a drive other than the existing one... (So long as you are not trying to install Tiger on a machine that came with Leopard...)

What if they bred? Stripes or spots?

Probably Spites or Strops