Nothing says "You disgust me" more emphatically than the exasperated sigh-meets-eyeroll unleashed the instant you walk into your shared kitchen to find a week-old, cheese-encrusted plate growing mold.
Sigh no more, darling. You've dealt with the filth and the grime and the hair and the nasty habits long enough, you poor roommate victim. Invest in a few of these passive-aggressive products and say, "You disgust me and you need to change," without uttering a word or straining an eyeball. Plus, everyone loves presents!