Can Medium help me get an extra vacation day?

The photo is my children’s face after I sang them a song I just learned.

“Old MacDonald had a farm,
E-I-E-I-O
And on that farm he had an infinite recursion
E-I-E-I-O
With an
Old MacDonald had a farm,
E-I-E-I-O
And on that farm he had an infinite recursion …”

Tell me your best dad joke. Nerdy developer jokes also appreciated!

Help me win a work contest. Visit the facebook post in my link. Like, share and leave a comment to help me win an extra day off!