Making Water Wetter reflection

The making water wetter lab was fun and but took sometime for Matteo and I. When we were doing the drops of water on a coin, we got some interesting results. I think its because me and Matteo are at different levels of dropping water on the coin. On the water i found it normal that the water would form a bubble and then the water would join the other water. But in putting soap on the coin i found it weird that the soap would form a bubble(normal) but then when the bubble grew up to about 1/2 a centimeter that after all the drops of soap would just slip off. The bubble was like it was un-penetrable.