Why am I so scared of daddy long legs!?

I was outside just now and a daddy long leg crawled up my arm. My first reaction was the most abhorrent gut wrenching blood curdling scream I could muster and it threw me into a major panic attack. I’ve held 10 foot snakes, spiders, pet stingrays and sharks, been stung by bees, but they never scare me. The fear I feel when I see a daddy long leg is easily the most immense fear a human could have. My brain literally shuts down. Help.