The guys bring in your stuff, and you sign the paper thingie.
They may also remove your old couch/mattress/what-have-you.
Do you tip them?
Do you offer them a beverage?
What if all I have is water? (Which is true 99.99% of the time.)
I never know what to do. So I wind up saying, "Have a nice day, thank you!"
And that's it. I always feel bad though.