3 ms·>Strychnine Smile Can also be caused by Tetanusby aqme28 2y ago>Strychnine Smile Can also be caused by Tetanusbregma 2y agoOr running for political office.glenneroo 2y agoOr getting into a car accident: https://www.youtube.com/watch?v=NIbotIsLJWw https://www.youtube.com/watch?v=NIbotIsLJWwlmm 2y agoThat's probably the botox. Deadliest known substance.