What makes you laugh? Does something always have to be funny for you to laugh? Can you ever laugh for no reason at all?
Just as with everything else you perceive things as funny because you say they are (what’s funny for one person may not be funny for another). Likewise, things are sad because you say they are. You provide the ultimate context around these feelings.
In saying this, I DON’T mean “never feel sad” or “block your emotions”. Doing so is unnatural and betrays eons of human evolution. On the other hand, being able to laugh and reframe your perceptions in helpful ways helps to keep you moving forward. Being able to laugh for no reason at all helps you stay in a resourceful state.