Today HEL-OUL-HEL, almost full flights, no seat block either way, no smoothie available ("first day of new smoothie"). OUL-HEL was almost full flight, I had only a large laptop case that I stored in the overhead bin during Group 1 boarding. When last person had boarded and there was no overhead space available for their carry-on bags, member of cabin crew took my laptop case out of overhead and told me to store it under the seat.

Real platinum experience. What if I was travelling with my full carry-on quota (2 carry-on bags + 1 personal item), should I then borrow also my neighbours underseat storage space to fit all three onboard?