The case was so:
I live alone. Winter session, evening, tomorrow exam. I need to sleep. I turn off the cell phone, the home phone and the doorbell so that I don’t wake up, I go to bed.
I woke up with an incomprehensible sound. I try to understand what and where. The sound repeats. and again. and again. Strikes on the balcony. from outside.
Here is the picture: the winter, the hour of the night and in silence the deaf strikes outside on the glazed balcony on the fifth floor. The strokes are ten with a frequency of about two seconds, then about a minute pause and again strokes. was presented?

The puzzle was this: a friend overwhelmed the lady, and they urgently needed a place to stay overnight. Without getting to me by standard methods, he slipped onto the roof (there is a crack there), glued the snow on the roof and threw it into my balcony. According to him, I did not react to the single ones, and he began to glue them in bands and throw them, respectively, in rows.