True story..
I used to play drums. I played with this group in the late 70's early 80's and during breaks the bass player would show me some stuff, and I would show him some stuff on drums. So we would swap spots in rehearsals and jam.
The group disbanded and we went our seperate ways for a year or so. During that time I picked up a Ibanez Roadstar bass and practiced constantly while playing drums for another group. I heard through the grapevine that a guitarist I knew was looking for a bass player so I went down to jam. Lo and behold, the drummer was the bass player I used to play with. I dropped the drums altogether and stuck with bass.
Mid to late 80's I fell away from playing to concentrate on college and my family. I picked up an acoustic guitar and just found I enjoyed the bass more. Just returned to it about 2 years ago. Not playing in any groups, just enjoying playing to CD's, and learning sight reading.
Some people play golf, I play bass.