When one feels like he/she noticed same event experienced in the past again for a brief time, afterwards in awe, feeling like time repeated itself exactly the same way, objects,people,sounds,smell, revived old memory you never remember you had.
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Most of the time Dejavu is left unnoticed. Just because it lasts for a shorter time than it takes to blink.
when you are listening to your ipod or mp3 player to a song and you realize the same song is playing in the background at the same time (or very close to)
kid 1:dude i was just listening to eye of the tiger on my ipod at the gym and the same song came on in the background! i thought they only played shitty music at the gym kid 2: holy shit you just had a musical dejavu
kid 1: jesus christ!!!!!