A young woman named Syd found herself in that exact situation and snapped a shot of herself in a gorgeous formal gown, which she texted to a pal.
However, she dialled the wrong number and the message ended up in a stranger's inbox - dad-of-six Tony Wood from Tennessee, USA.
'I believe this message was intended for someone else,' he replied.
'My wife isn’t home, so I couldn’t get her opinion, but the kids and I think you look stunning in your dress! You should definitely go with that one!'
Adorably, he'd attached a photograph of his gorgeous brood giving Syd a big thumbs up.
Too cute not to share, Syd's friend Mandi posted the message on Twitter.
Turns out, one of Tony's kids was missing from the frame, his four-year-old son Kaizler.
His mum was by his side in hospital as he underwent chemotherapy to treat leukaemia.
Commenters quickly discovered a GoFundMe page, which a family friend had set up two years ago to help fund Kaizler's treatment.
Touched, they began donating and $40,743 has now been raised for the family!
Before the tweet, they hadn't even reached their goal of $10,000.
'It’s been amazing and is a bigger blessing than anyone could ever know. We were backed up to a financial wall. I’ve been working the entire time, but I was slowly but surely succumbing to the financial rigours of the situation,' Tony told Bored Panda.
Never has a wrong number turned out so right!