Quick little trick I do (this works if you can feel the annoyance manifest in your body, which is what happens for me):

1. I breath in slowly, and imagine the annoyance feeling I have as a red light, being sucked up into my forhead or into my threat
2. I breath out, imaging the red feeling either shooting out of my forhead or being expelled from my throat.
3. If the annoyance starts to come back, I'll repeat this two or three times.