Dad appears to have trouble with doing two things at once... singing "Happy Birthday" to his son, and popping confetti at the same time.
Or dad is just bad at directions. His sense of it was a little off when he popped the confetti and the mini cannon was turned the wrong way, facing dad's privates. OWWW!!!
Dad spouts a few choice swear words in front of the kids, but as a man, I understand.