I'm ashamed to admit that I used to do some pretty disgusting things to the tea and coffee at the bank where I used to work.
I hope you're kidding. What made you decide to mess with the tea and coffee? Did the people do something to you?
I just wanted to vent my anger on them
Wanting to vent your anger is fine but doing so at the expense of other people who aren't even related to why you're angry is messed up. On top of that you tampered with their food. What would have happened if someone got really sick?
Luckily I don't think anyone ever got sick.
You are indeed lucky that no one got sick. I hope you've learned that messing with people's food and drink is not something you should ever do.