Once I received spam in the form of a giant group text. People started responding with "STOP", attempting to opt out without understanding the situation. Trying to be helpful I sent a message like, "hey, please don't, you're sending this to dozens of people & it won't do anything."

Immediately someone from the list started trying to call me, and sending me threats me to report me for spamming. I think everyone else got the message though, and the replies stopped shortly after.