I like that you have found a unique way to introduce yourself! I have to try out anchoring more often. A really great tactic that I have been using lately, not necessarily to negotiate but to get people more willing to work with me, is to ask personal questions when meeting someone.

Instead of just saying "Hello, how are you?"
Follow up with "How long have you been working here?...Wow that's a long time. What is your favorite thing about this place?"

It seems weird to ask that to a stranger but if you do it within the first 5 minutes of speaking with them you will see their entire body language change from formal and polite (not wanting to answer 100% honestly) to personal, slightly vulnerable, and genuine.

Then it is easier to ask them a favor, etc.

But it only works if you actually care about their answer (or seem like you actually care).