oil filters, i tighten the fuckers up...... I have a mechanicless mate that always stands over me crying finger tight mate finger tight.....pffft
I never put my car in for a service, but i did once, I directly said at reception what i wanted done "yep yep we can do that"..... I get the car back to find they had read the speedo and completed the relevant service for the kms, and hadn't done half the shit I wanted..... A few weeks later I find oil dripping from the engine plastic under tray, It had filled up with oil from literally a finger tight oil filter.

Don't get me wrong I don't go stupid tight but they aint going to leak.