One of my most effective teachers was my 5th grade teacher, who still suffers from a degenerative muscular disease (MD). She dealt with students almost exclusively verbally and was very sarcastic in the classroom. But she was funny. And she thought we were pretty funny too. Though she wasn't particularly strict, she was the kind of teacher everyone respected because it was so obvious she cared about us and loved her job.
One thing I tried very hard to implement in my own classroom after her (aside from sarcasm, which might also be genetic) was her ability to delegate tasks to students. She had to, because of her physical limitations. But honestly, it invested us in our classroom and our desire to help her and each other. Even at the high school level, I've attempted to create classroom "jobs" of sorts, to give students a feeling of ownership and belonging in my class.