>Party fighting monster in cave
>Hey DM are there any stalactites on the ceiling I can shoot to make them fall on the monster?
>Party fighting invisible enemy
>Hey DM is there any flour or other powder around I can use to throw at them?
>Party fighting flying enemy
>Hey DM is there a blanket or something lying around I can throw on them to weigh them down?
How about using the tools in your toolbox to solve the problem instead of asking me to magic up a solution?