Build, not burn those bridges

The entrepreneurial world can be quite small sometimes, and it's very important to build relationships in it.  These relationships become the foundation and resource for solving problems that your company eventually encounters, whether it's raising money, finding a strategic partner, or finding a key employee.  A large component of a company's ultimate success stems from its relationships.  And in this ever-increasing world of social networking, it's essential that these relationships are maintained and never burned.  If you don't like the fact that a VC kicked you out after just 10 minutes, or will only offer you ugly terms, or whatever, just walk.  Don't retaliate.  Keep that relationship, because you might need him in the next company you start.  Or, he might be contacted by another VC you're pitching, and you need that positive reference.  Same goes for relationships with employees, employers, business partners, etc.  Do you have a particular experience you'd like to share here?