Elsewhere I complained about a Facebook friend that became what someone called a "Math bully." Since it only involved basic math, the rest of us just used our keyboard, but as one of her countless proofs that she was right and the rest of us, math professors, and other professionals were wrong, she scribbled something on binder paper and took a nearly illegible picture with her cell phone in poor lighting.
Don't do that. It does not lend credibility.
Don't use crayon, either!
Order of operations, for the win!