I have to say it was a good day: Avodah Zarah 3b

I love this Midrash.

Rav Yehuda said in the name of Rav: There are twelve hours in a day.  During the first three, The Holy One Praised be G-d sits and learns Torah.  During the second group of three hours, G-d sits in judgement of the world.  When G-d realizes that the world is worthy of destruction, G-d moves from His Throne of Judgement to His Throne of Mercy. During the third group of three hours, G-d provides food for all creates from the mighty Re'emin to the lowly lice.  During the last set of three hours, G-d sits and plays with Leviathan, as it is written (Psalms 104:26) "You created this Leviathan to play with." ... Rav Acha said to Rav Nachman bar Yitzchak, 'Since the day the Temple was destroyed, G-d no longer plays... What does G-d do instead during the last part of the day?  He sits and teaches Torah to little children in the kindergarten.