"Hey," you call over to your two friends, "Check this out." Tom and Janice step over and look at your find.
"It's probably just some joke," Tom decides. "Let's open it and see what's inside."
"No way," Janice says, "that's way too creepy, just leave that alone."
"What if there's a person in there who wrote that?" you ask. The discussion goes around like that for a minute, but the decision ultimately falls back on you. Your friends have agreed to accept whatever decision you make, so there's no pressure.