Yikes!
Social media has made all different kinds of challenges very popular. A few years ago, there was a number neighbors challenge, where the objective was to send a text message to a person with one digit higher or lower than your phone number. This person received a very disturbing response when they decided to participate in the challenge.
It turned out that this person’s number neighbor was someone’s late husband. And it was probably a recent loss if the number was still reachable. Even though no harm was meant, reminding someone of their late husband can easily ruin their day. This was probably the last challenge this person ever performed.