Last night I went to a bar with my roommate. We ordered the same drink (Campari spritz of course) and I quickly begin to drink mine. My friend is much slower than me: when I finished my drink they had barely drink a quarter of their so I order another drink (another Campari spritz of course).
When I finished the second one they were still drinking their first, so I ordered another one and then another again.
After my fourth drink, they finally finished their drink so we paid, we exited and we got back home.
Today I found them dead in their bed, the doctor said they were poisoned.
The poison was in the drinks and all the drinks were poured by the same bottle. Why did my roommate die but I did not?