After handing a stranger my main bass without a second thought then immediately regretting and panicking for a half hr.Not something that happens regularly but over 20 years of playing gigs it has happened multiple times
These days though my basses are a little more foolproof. My dingwall can run in passive mode and the output jack is located on the end of the bass. my backup is a passive fender jazz bass and it's jack is on the top of the bass. I bring both basses to every gig. I typically just play the dingwall but I like not having to worry about not having a backup and I play multiple band original band shows as well and sometimes other bass players have issues and I'd much rather hand someone the Mexican fender jazz I paid $400 for than my Dingwall.
I started bringing a spare because I never want to be EITHER guy in that situation ever again.