A lot of my energy is wasted on worrying! :0(
By keeping the doors open when the A/C or heat is on.
By leaving lights on unnecessarily
I don't know if this is "wasted" energy, but waking up in the morning seems to occasionally wear me out.
Through heat loss.
Change in energy(delta E) = heat(q) + work(w)
Using the simple definition of energy, the ability to do work, one can see that heat is always lost from the system, thus you could say energy is wasted.
By repeatedly cleaning up after my Landlords dodgy builders. Just don't mention the words "brick dust" to me, it might send me into a meltdown O_o