"I'm so happy that I'm sad"

Yesterday, Samuel was having a tough day. Things were just not going his way. Little things would make him blow up and he was just struggling (I think Halloween parties+candy probably did a little number on his body and made him extra tired). At one point of the day, he started bawling because Sofia got to stir the pumpkin muffin mix first. He ran to the playroom and shut the door and bawled. After letting him cry for a bit, I finally went in to talk to him. When he had finally calmed down, I asked him why he was crying. He answered that he didn't know. So, we decided to try to figure it out. "Are you crying because you're mad or because you're sad" "SAD" "Are you sad because it's raining outside?" "No" "Are you sad because you want Sofia to play with you?" "No" "Are you sad because daddy's not home?" "No" "Are you sad because Sofia got to mix the pumpkin muffins first" "YES" Hmmm...Recently, Samuel's started to notice that sometimes people cry because they're so happy and not only when they're sad. We've explained that sometimes you can be so happy that you cry. So, he quickly added his explanation "Actually, mommy, I was just so happy that I got sad." Mystery solved.