going off!

I made a trip back to old apartment today to skyre my folks & tell them we had moved as dint have time to email them before the move、(I rang them but they werent home)、
and to pick up some stuff we left behind. I came in by train、 and was 2stations away on my way home when I had a shocking thought: ゛did I lock the door when I left?゛ aaaarrgh! so back I went to double check(and of course it was!!!)
so I am finally on my way home now by train、 when I hear a ringing as I wait for the train、 figure it must be some sort of signal or something. Get on the train & Ican still hear it、 it even seems to be gettimg louder、 especially when I take my backpack off....
yep、 the alarm clock in my backpack was the culprit. Talk about going off、 literally o(^o^)o