Clostridium botulinum

A deadly bacterium. Has the ability to form endospores when exposed to harsh environments. A telltale sign of these little buggers are bulged bottoms of canned goods. The toxin it produces can cause death within a day.

Person 1: Dude, wanna eat some Spam? I'll open a can for you.

Person 2: Hey bro, don't open that. The bottom's bulged.

Person 2: So? What does that mean?

Person 1: Bro, that thing's infested with Clostridium botulinum.

*throws Spam in trash bin*