Question

why we laugh simetimes without any reason

Answer 1

love and affection makes you laugh sometimes with no reason and many other things unconditionally

Answer 2

Sometime we laugh without reason when we feel excited, when we remember some old joke we get laugh and something when we miss someones naughty things we laugh which is the laugh without reason for the one who sees us laughing and we sometimes really laugh without reason which is known as in love.