I am horrible at lip-reading.
And the funny thing is that people do it all the time. Just a few minutes ago, a coworker mouthed something to me across the office (not wanting a particular person to see) that I just completely missed. People do it at church, too, when, you know, they don’t want to disturb people by speaking out loud.
In these situations, I wish more of my friends and associates knew JSL.