The slime craze is all the rage among tweens. Slime is a homemade stretchy play material created by mixing together household items such as school glue, borax, shaving cream, and contact lens solution. We present a case of allergic contact dermatitis secondary to methylchloroisothiazolinone/methylisothiazolinone (MCI/MI) in school glue used to make slime; mass spectroscopy confirmed MCI/MI in the patient's glue. Clinicians should be aware of slime as an emerging source of MCI/MI contact allergy.