I have a nice Klein.
I had a $5K Venge (bought used for much less)
etc, etc.

The bike I always seem to remember most, and the one I recall having the most fun on (as an adult) was the POS BSO I found in the garbage in my 20's; resuscitated, and rode the crap out of and enjoyed.

Didn't have to worry about it being stolen (Thieves would feel sorry for me); didn't care if I got caught in the rain; if it fell over; if I rode over a curb or down some stairs....

It was a fun and care-free bike. I didn't even have to think about the bike; just rode it and enjoyed the ride- and it did exactly what any other bike does...you pedal it, and it goes. It was faster than the Venge. [May have had something to do with the fact that I was in my 20's when I owned the BSO, as opposed to my 50's with the Venge...ya think?]