You laughing and their reaction.
He smiles- how can he not? He leans closer subconsciously, and casually puts an arm around you. He gets ready to tell you another joke, because he wants to hear you laugh for him again.
He freezes. Not only did your laughter give him LIFE, it was simultaneously the most goofiest and most beautiful thing he’s ever heard- period.
He gets so excited! You’re laughing at his joke! Success! He loves hearing you laugh because it’s so uplifting and fromnthe heart. After a stressful day, he’ll do anything to make you laugh because its a auditory antidepressant.
He tries to hide his smile under his palm, propping his elbow up with his other arm so he can just watch you laugh and undoubtedly add 20 years to his lifespan.
She laughs with you. Her arms are around you and she admires the melodiac tune and rythym to your laughter. The twinkle in your eyes makes her grin for an hour straight just thinking on it.