Can Disney sue you for drawing Mickey Mouse?
Can Disney sue you for drawing Mickey Mouse? Disney's characters are copyrighted. You can't use a drawing of Mickey Mouse and sell it on a mug, unless you have authorized consent to distribute the image. Disney has a reputation for being ruthless about protecting its intellectual property (example stories of folks getting sued here and here).
Can I put Mickey Mouse on a shirt and sell it?
Unless the t-shirt make obtained a license to do so from The Walt Disney Company, it is copyright and/or trademark infringement to sell Mickey Mouse t-shirts. They are not allowed to do so, and people do it anyway risk the chance of being sued.