Answer:
I am there when you sit, but gone when you stand. What am I?
Sometimes I annoy you, sometimes you can't live without me. But no matter how hard you try, you can't destroy me. What am I?
I drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
I help engines spin and pants stay up.
I can be short and sometimes hot. When displayed I'm never cold. What am I?
When is it bad luck to see a black cat?