system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does tilting your cup to the side reduce the amount of head when pouring a beer?
gpt
Think of it like a playground slide.  If you just jumped off the top of it onto the ground, it would hurt (large impact, large amount of force).  If you jumped down the slide portion and slid down, it would be more comfortable (less impact, less force).  Just like with soda, there is CO2 in your beer.  When you shake (cause impact to) the beer/soda, the CO2 is released.  So by "sliding" the beer down, you put less impact/force on the beer, giving you less bubbles.