Honestly, this can be very much be done and people crave it. People crave being noticed and affirmed and getting to engage with others on more than just a superficial level (as long as you respect their boundaries and recover if you faux pas at some point). People can be very gracious/graceful when someone reaches out to them in this way and will often “play-along” because I’ve noticed basically everyone refuses to be the first one to step out of their comfort zone and take a chance pal-ing around with a stranger but I can find a way to make most people comfortable and maybe even get a chuckle or 10.
Its been very good news for me and the good news for you is you can too, if only you do this ONE weird trick strangers love