People who stop walking in the middle of the sidewalk and ruin the "flow" of pedestrian traffic.

These people always stop for the stupidest reasons like.
1 - They're walking with someone else and they conversation apparently warrants a full stop of movement
2 - They think they saw someone they know ... oh no wait ... they didn't.
3 - They think they saw a UFO.
4 - They're a tourist who needs to check their map and moving to the edge of the sidewalk is out of the question.

WHY??? These people always look at you like you're evil when you accidentally walk into them too. Especially if they're tourists. They look at you and think that Montrealers are rude, which is not the case. YOUR people are idiots.

People Who Argue over arbitrary shit that doesn't matter.

I am a phone sales representative for classified ads. Recently, we stopped mailing out physical receipts in order to save the environment. In any case, all the situations for which you might need a receipt from us will work the same with a credit card statement. Every second client I speak to, and I kid you not, puts up a huge fight about this. I'm not going to lie, I've lost sales because of this. It's a huge pain the ass. Most of my conversations go like this:

Landlord: ... and I'd like you to mail me a receipt
Dee: I'm sorry, but due to our new green initiative, we no longer send receipts.
Landlord: But I need it!
Dee: Actually, the main reason that we stopped mailing receipts is that, because your credit card statement contains the same information, a receipt from the Gazette is redundant. You actually DON'T need it, sir.
Landlord: That's STUPID. I want a receipt.
Dee: I understand. However, we no longer provide receipts. You can use your credit card statement.
Landlord: But I need a receipt because I want to sue my old tenants for the cost of the ad.
Dee: Yes sir, but you can present the judge with a copy of your credit card statement and it will serve the same purpose.
Landlord: But my credit card statement won't say that it's for a classified ad. It won't show the ad text.
Dee: Ah, but neither will the receipt that we send out. Even if we could still send you a receipt, the only information that it would contain is that you paid the Gazette $46.28.
Landlord: WHY ARE YOU DOING THIS TO ME?
Dee: To save the environment, and sir - your credit card statement will serve the same purposes as a paper receipt from us.
Landlord: grumble grumble grumble. etc. etc. etc.
(5 to 10 minute conversation)

People Who Lean on Poles on Public Transport

What is wrong with these people?? Is it not clear to them that the poles are there for the MASSES to hold on to in order to avoid falling? The thing about these people is that they are always so self-involved that when you try to hint that they are preventing you from keeping your balance by sneakily forcing your fingers between the pole and their back, of course, apologizing, they turn around and give you a dirty look. Seriously. Hate them.