Laughing while depressed?

Hey i have recently seen that i tend to laugh a lot uncontrollably when i’m in this sort of mixed episode (manic and depressed) i can’t take anything seriously, even is serious! and just laugh it off even i have a lot of dark bad thoughts. I was wondering if anyone do the same or experienced it, that you tend to laugh when you’re depressed and just joke about problems that happen in past or that happens?
Thx for all answers! Have a nice day.