Acts 2:2

2:2   And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting.

Interpretation:
         Suddenly, out of the blue a sound is heard by the apostles.  I am not sure if at the very moment they knew it was from heaven or not but they soon found out that it was.  The sound was described as a rushing wind... and it filled the whole house... which reminds me of
  
   1 Kings 8:10-11 "And it came to pass, when the priests came out of the holy place, that the cloud filled the house of the LORD, so that the priests could not continue ministering because of the cloud; for the glory of the LORD filled the house of the LORD." 
   
      I know that the apostles didn't necessarily have a cloud fill the room but... I see a similar picture.  It was the Glory of God that entered and filled the room.. so much so that they were not able to minister...?  well I think so.  Because you will see that they were all of one accord as described in verse 1, and now in the next verse it describes what they do after this rushing wind filled the room.  They spoke in different tongues?  That was not them speaking it was the Spirit of God speaking through them.  Because I don't think they knew those languages.. because that was the very thing that was a Testament to the people that God is real and that the apostles knew this God.

Application:
        The application that stands out to me is the fact that I see in both Acts 2:2 and 1Kings 8:10-11 that once the place was emptied of self that God came in.   The apostles were in one accord "not being selfish and thinking of themselves"  and the priest "came out" and God "Came IN"  so I pray that God would give the me strength to get outside of my self and to make room for Him.  As John the Baptist said "More of Him and Less of Me"