Nice Job Breaking It, Hero!: Strangles accidentally knocks down a set of chemicals that when mixed together create a toxic cloud that almost kills Bart when he stays in the school looking for Strangles.
Reptiles Are Abhorrent: Averted. Despite his rather menacing appearance, Bart's pet snake Strangles is completely loyal to him. When Homer strangles Bart, Strangles strangles him, and when Bart is in danger thanks to mix chemicals in the school, he comes to rescue him. The worst thing he does is eat Martin's pet rabbit, which he did with Bart's approval.