Are all your offers low, or have irritating clauses?  

I derive humour from irritating A holes.

The call takes 60 seconds, and even if only 1 in 50 is interested in selling, you would do well.Even though it only takes 15 seconds to say "no thanks" and hang up, it is irritating to receive calls like this.

He was exceptionally irritated (made a note that I "wasted his time"), which will likely hurt his impression of our project later and could make things more difficult for us. 

The cash flows can be very slim when starting out, not to mention, one person always feels like they do all the work and they begin to get irritated.

This irritated me very much, b/c he also hadn't been great about timely following up with me on other issues, then he drops this on me.

One of the things that irritated me the most was that they were typically only on site around 7-7.5 hours a day, mon-fri, even when they were weeks behind schedule!

But while I can't be mad at myself for being so disciplined about paying down my loans that I'm now only looking at 9K left to finish off, I am slightly irritated that it took me that long to realize I could be MAKING more of a return on the money I was handing over to the banks.

I'm very irritated that it came out that way but by the time I saw it almost the whole house was done.

Eventually, I will succeed at my goals, yes I'll be irritated and a little frustrated but I'll get over that and continue moving forward.