purchased me a 12-30 Tiagra 10 speed cassette, and mid-length rear der. and left it at the shop with instructions to install it on my bike. Paid for it, and the service, and asked the manager not to say who did it for me.

I thought that was pretty darned nice of someone. I currently have 105 with an 11-25 that has caused me a bit of knee issue going up hills. They cared enough as well as paid attention enough during a ride to notice and hook me up.