really wierd thing happened today

i was half asleep in my art class, and i guess i was kinda in a half trance. anyway, i very clearly heard a person behind me tripp and fall. i heard them let out a short gasp as they ran into a desk.

the strange (alsmost scary) part is that when i turned to see who it was, i saw someone walk in the door, tripp, and gasp as they ran into a desk. it was the same.
this has happened to me before, but still, it really shook me for about half an hour.

has any of you had similar experiences?