Have you ever wanted to relabel the data in a wire for bundling so that Unbundle by Name comes out the way you want?
Have you ever wanted to get the default value for a data type?
Sure, there are usually ways to do it, but they're kind of clunkly on the BD. Here's an XNode that does it and looks nice on your BD (just drop the .xnode file on your BD.

"If you weren't supposed to push it, it wouldn't be a button."