This is a small lifehack that actually takes less than 1 minutes to learn.
Instance: You're booking tickets for a movie in bookmyshow or similar website, and one of the person who's coming with you is not sure that he/she will be able to make it to the movie.
Let's say you're booking tickets for 5 , and one person may or may not join you. But if he/she joins later, you can watch the movie sitting together if you learn this lifehack.
When you're booking tickets, instead of selecting the seats like this
select your seats like this
or like this
The thing is, there is a very good chance that the single seat will not get booked as generally most people don't go to the movie alone.
So, if your friend is joining you at the last minute, you can select that remaining (hopefully) single seat and you can watch the movie together.
In bookmyshow, if you want to book 5 seats and you select a seat directly, continuous seats will be selected. But if you select them in the following way it is possible:
For example, you just have to click the 4th seat from the end if you want to select 5 seats. It will select only 4, and now you have a choice to select the remaining seat wherever you want. You can do it in many ways. This is one of them.