There's no doubt this man was excited to hear he was going to a grandfather.
But that happiness turned to overwhelming joy when he learnt there were twins on the way.
The mum-to-be, identified only as Leann, kept news of her pregnancy secret from her father until she visited him towards the end of her first trimester.
[Language warning for video - he is shocked!]
Leann's dad was so happy about the pregnancy news he at first failed to notice there were two babies in the ultrasound photo his daughter handed him.
"Are you serious?" he repeated over and over as tears rolled down his cheeks and he struggled to stay upright.
The touching moment has been viewed more than one million times since it was uploaded to YouTube.
We can only imagine how excited the grandpa was once the babies were actually born - Leann has returned to YouTube to say that the twin girls are now four months old and the family lives in San Diego.
Want more? Watch another sweet dad learning he's going to be a grandfather.