I read a story once in a textbook, I will share it with you:
Basically, it boiled down to this:
In the summertime in (fill in city here), there was a strong correlation between the purchase of ice cream cones and armed robbery. Does this mean that ice cream cone purchases caused the robberies? No, it just means there was a strong linear correlation.
It's a very tricky concept to learn. Generally when we think of x increasing and y increasing we are tempted to read into it too much and say "x causes y". Sometimes, x does cause y, or y causes x, but not always.
Does this help?