What are some ways to boost positive feelings? If surrounded by negativity?

Like imagine you’re stuck in a room, and in that room is a blind lion… You don’t know the lion is blind because the room is dark.. and he paces back and forth and it’s hard to completely make it out but you know he’s there..

Is it possible under extreme situations to still make yourself positive? To feel good? Say in this small room you still have access to plenty of things..

But every time the lion gets up and paves it sets you off..

Idk what I’m supposed to do with all this..