Sure, Just like a refrigerator, an A/C has oil suspended in the refrigerant. as long as you set it right-side-up for 24 hours before trying to turn it on, the oil will settle out of the compressor head and be fine.
Yes.
To symbolise distress. If you simply turn it upside down then it would symbolise distress, if you rotate it however it is still the same.
It is still a triangle.
Possibly a stuck relay
It would be potential energy as long as the boulder stays still.
yes
yes
Yes.
pig on these are both words that look different but are still a word upside down.
You can smell it and your hair may look greasy.
yes it is still being used today.......depends where your at.
turn upside down and stay still