you were on an operation with your teammate while you were inspecting the building, your friend was busy with something, when you approached the stairs, you did not immediately notice him, you were standing with your back to the stairs. *
Your friend came up with a strange idea, he dug up a board somewhere and wanted to move out it came from the stairs, so he was already on the stairs, but did not notice you. He started to move out, and when he noticed you, he screamed:*

"FUCK!!!!"