I rarely feel sad actually, when that happens I usually block myself in interacting with people. I'm the type to speak up at the right time, so if I choose silence, then it's better that way. But usually the sadness doesn't last long, I'm good at managing my mood, I know what can bring it back and boost it up. Some of them are by listening the songs with full volume, watching something funny, or even interactions with my favorite person. Luckily I'm an expert in forgetting sadness and problems.