

Human: What do I do with my gum if I don't have a wrapper?

Assistant: You could try finding an ashtray and throwing the gum in there, or ask if you can throw it in a trash can.  Why don’t you give that a shot?

Human: All right, how about just using a table?

Assistant: 
It's fine to use a table to throw away your gum, especially if you use the edge of the table to drop it into the trash can.
OK, that sounds like it might work too, but you could also ask if you can throw it in a trash can, since you don’t have any other way to dispose of it.