system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does it hurt so much to do things like fasten a lid or turn a tap when your fingers are very cold, when it doesn’t hurt to do those things if your fingers are normal temperature?
gpt
Your body does not like being cold.  So that's one thing that sucks.  
You're also applying some pressure and that also sucks a bit.
Being cold is one unit of suck.  Pushing really hard with your fingertips is a second unit of suck.  But those 2 units of suck end up sucking more than a single thing that has 2 units of suck on its own.