What word or words mean to irritate trivially?

Here are some words and phrases that mean to irritate trivially:

General:

* Annoy

* Pester

* Nuisance

* Irk

* Vex

* Bother

* Irritate

* Get on one's nerves

* Drive one crazy

* Bug

Informal:

* Tick off

* Get to

* Grub

* Piss off (stronger, potentially offensive)

More specific:

* Nitpick (to focus on minor details)

* Nag (to repeatedly ask or complain)

* Badger (to persistently annoy)

* Harass (to persistently annoy or bother)

The best word to use will depend on the specific context and the intensity of the irritation.