Well as long as it's not on the desktop... It's not likely.
I've also tried to see what happens when you "just toss it" and I found out that the screen is only activated by a surface of a certain size, so full pocket cloth is not likely do do much harm even with emelfm2 open as it would either be in contact wit too much surface to react, or pressing more than one item at the time would not register.

Practicing ways of launching apps is a good exercise for anyone who wants to learn more and I've actually learnt quite a few interesting things by doing this