My Story: Some of my friends and i go ECP for bbq... It's about 8pm and some of the guys were bbq the food while the girls sitting eating the food...

Suddenly, they run up to the pit, and tell us that they heard some sound... Is 'humming' sound... and the others try to hear it... but they never heard it... but, i did heard some sound, but i didn't say... I try to look around, check where the sound come from. But i juz can't see anything there. Btw, it's on the 7th month....