"Blood types are like gang affiliations. Some get along fine, but others have whatever those especially passionate feuds are called. For example, if you have type A blood, your body will corner and beat to death any type B cells unfortunate enough to wander into your turf. The results for your body are fucking horrifying."
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database