Whats the weirdest thing you’ve found while looking at mutations in living organisms and what would you call weird or

Question: Whats the weirdest thing you've found while looking at mutations in living organisms and what would you call weird or how does a sensor know it is weird?
- Keywords:
  mutation,
  organism,
  sensor
Asked by Theo to Marcello on 14 Nov 2019.
- Marcello Valente answered on 14 Nov 2019:
  
  Dear Theo,
  by the dictionary we define weird something that works in a different way then we can think and if you are a scientist you generally see a lot of weird things.
  The most weird and dangerous thing I ever saw was a bacteria able to survive antibiotics, meaning that it was a mutant, luckly it wasn’t able to survive high temperature.
  My sensor can detect “weirdness” by checking the DNA of any subject.

Question: Whats the weirdest thing you've found while looking at mutations in living organisms and what would you call weird or how does a sensor know it is weird?