Precisely. That's *exactly* what the trap is for. Many people believe, mistakenly, that the trap is there to catch objects and stop them from going down the drain. Nope. It's there for one reason: to keep sewer gas from coming
*up*. And that's why it's important for there to be water in the trap all the time.How many times do you need to be told it's not a good idea, before that finally sinks in?