The coolest one was in a video by an awesome scientist called Bart Lambrecht who works in Belgium. He filmed a dendritic cell, which is a cell similar to a macrophage, but it has lots of long arms that it uses to catch bacteria. The dendritic cell was reaching its long cell arms through the lung wall, into the airspace to try and catch bacteria. This was in a real piece of lung, and was the first time someone had filmed this happening. It was really cool!