I'm wondering if anyone has come across some unusual correlations in the market - something along the lines of - if sheep commodities increase in price, silver futures drop.
I made that up, but I want to see if there are any correlations that you've come across that at first glance seem very unlikely, but when looked at closely reveal that there is either a direct correlation (ie - up/up) or inverse correlation (down/up, or vice versa) over the course of hours/days/weeks.
I'm not looking for obvious things - such as wood futures going up affects lumber and sawmill co's., or when oil goes up, Exxon and Chevron go up - those are relatively easy to correlate, and with some timing can yield good results.
What I am looking for are stocks/options/crypto/commodities that would not have an immediately obvious correlation (inverse or direct), but somehow seem to affect one another.
Also, even if it is an unusual correlation, if you know why the securities act in tandem I'd really like to understand that as well.
If possible, please provide historical examples to back up your claim, otherwise it's just noise - ie, charts, figures over time.
Thanks!