You can spot the moment someone loses interest in you/what you are saying.
I went to a fair for start-ups today. Almost the oldest person there, but oh well. I was waiting to see one booth and I took a small Twix from a bowl and then put it back and took a Three Muskateers. One of the guys had to comment to me that he was very disappointed. I told him it was because I would never buy a TM, but I do like them.
In any event, we started talking and it was a very interesting organization. Of course, he asked what I do/was looking for, and as soon as it wasn't data mining or software engineer, his eyes went blank. So I exited quickly. Of course it didn't help that I didn't practice my pitch so I said xxx which didn't apply to that world at all.
Whatever. I got 4 free t-shirts out of the fair, as well as some lip stuff, a mini light, and a small spiral notebook. As well as a few neat stickers.
This morning at a career session, I rated my attitude right now as 2 out of 10. That about sums it up.