snug as a bug
Though intended to mean 'comfortable,' looking deeper into the phrase makes anyone who says it sound like a retard. Bugs (insects) are exoskeleton based; they have rough, spiny, or hard shells, and implying that you are comfortable when being coated in spiny shells just seems straight up stupid.
snug as a bug by plain goldfish January 24, 2011
Get the snug as a bug mug.