Since I don't live next to a LEGO store I don't often have the opportunity to stand in front of a Pick A Brick Wall. Recently, I filled my large PAB cup for the second time. When I browsed the wall, I found several pieces that fit into my current (or near future) projects. I was aiming for small parts, since the price on Bricklink would be at least some cents each.
Here comes the question: I needed some trans-clear 1x2x2 panels. I took some, walked back and forth, put some more into the cup, and ended up with 43 (!) of them. But I was sure that I only had 10, maybe 15. Am I crazy? How can I so dramatically underestimate the number of those panels? Do you know in advance what to put into the cup? What is your PAB cup strategy?