Oh why not...
A night of cuddling with my partner (No sex, just talk)
The look in her eyes when I go pick up my daughter.
Her yelling from my ex-wifes porch "DADDY!"
My daughters little arms wrapped around my neck.
Her saying "You're the best daddy in the world"...(that one makes me bawl almost everytime, I was so afraid I would be a horrible dad since I had a horrible dad).
Her saying "I love you, Daddy"
A good cry (Normally shortly after one of the previous five statements)...weather it be about good things or bad.
Listening to music
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Peace and Tranquility all depends on your frame of reference.