system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't I tickle myself?

If someone else touches my sides or armpits, it feels tickly. If I touch my armpit, I just feel weird that I'm fondling my armpit. What's up with that?
gpt
When you tickle someone, it triggers a panic response.  The person consciously knows they are in no immediate danger, but sub consciously they feel attacked.  This makes for the uncontrollable body movement and laughter.  When you tickle yourself, your conscious and sub conscious agree, you aren't going to harm yourself, thus, no response.