system
Given the following post, respond as if you're commenting on Reddit:
human
Why when I tilt a cup to slowly pour liquid out, does the liquid not fall straight down but seems to grab and runs down the outside of the cup instead?

I presume it's got to do with path of least resistance and the liquid itself is holding some sort of resistance...but I'm sure some high school physics would explain this better.
gpt
It is a combination of surface tension and van der waals forces. Surface tensions keeps small drops of water in a spherical shape and van der waals forces will gently make it adhere to most surfaces. These forces are relatively weak and not very noticeable on large scales. 

Edit: It's a combination of hydrogen bonds and VDW forces and surface tension is a product of this.