Another major adult moment: Changing spark plugs after 108K miles. From $100 at a mechanic down to the low low price of $27 from the auto parts store and twenty minutes worth of gratuitous thanking of my engineer boss.
In related news the Honda dealership gave me a bottle of engine coolant for FREE. I have got some good car mojo happening. This coinciding with a Halloween candy sugar high = me grinning uncontrollably and skipping around like a fool. I like it.