When it comes to someone's special day, whether it be a birthday, wedding, or baby shower, there's one pretty important unspoken rule that most people understand: don't steal the thunder. For some entitled a-holes out there, the mere thought of not being the center of attention for one second is just too much to bear. After years of struggling with infertility and multiple miscarriages, redditor u/rainbowbaby2022 and her husband were delighted to finally be having a baby and planned to celebrat…