<human>: This actually happened last year, so technically LYIFU
I was on a vacation in Berlin with 2 friends and on the last evening we decided to have dinner in a restaurant just outside the Sony Centre. 
The weather was good so we sat down at one of the many table outside and we stayed there for some 3 hours, eating and drinking.

Around 11 I went for a few minutes inside the Sony Centre in order to get some pictures of the ceiling while it changes its colours. Meanwhile my friends stayed at the restaurant.

Here is the FU: after my little photographic session I walked back to the table, and without blinking I sat down. Immediately I start showing the pictures from the LCD of my camera, giving detailed explanation in Italian. 
After what could have been 30 seconds I heard someone laughing their asses off, I turn and see my friends at a nearby table.

I turn back to the table and I find myself facing two complete strangers.
In a split second I realize that I sat down at the wrong table and this young couple was still trying to understand if I was trying to sell them the camera on which I was showing the pictures or if I was just plain crazy.

As red as I will ever been I got up and while profoundly excusing myself in every language I know, I backed off the table toward my friends.

Can you provide a brief overview of the text?
<bot>: I sat down at what I thought was my friends' table and started showing them pictures before realizing that it was the wrong table.