If I really enjoyed watching something, or finish a long conversation that was slightly exciting because we kept finding new things to talk about without pause for a while or I have a moment where the weather and atmosphere is right and a perfect song plays that reminds me of them or just how ideal the song is fir the situation.
It's the perfect moment to kiss someone you like and embrace that memory. Emotions are great at making you remember those perfect little moments that make life worth it. You have everything in that one moment and your own little world.
So many little factors make the perfect opportunity. Why ignore and waste it?