All day Ianto had been grumpy, grumbling whenever anyone asked him to do something and going off at anyone who said anything that could be interpreted as an insult. Sometimes he got angry when nothing happened.
It started when Owen walked into the hub. "Nice suit" he commented to Ianto "But I like my lab coat better" he continued with a cheeky grin. "What did you say about my suit?" demanded Ianto, with steam practically coming out of his ears. "It was a joke, man" replied Owen "Just messing with you". Although the problem was resolved, Ianto still looked infuriated.
Next, when Toshiko asked him to proof-read her report on the similarities between the human brain and a computer, Ianto just glared at her, as if he was trying to see through her. "Ianto? I asked you if you could read this report" repeated Tosh. "I heard you the first time" he shouted "And no, I don't have time". "What are you doing that prohibits you from having enough time to read through a short, 384 page report?" inquired Toshiko. "Stuff" was the reply.
Although all these contributed to Ianto's bad mood, it was Gwen's actions that tipped him over the edge. "Ianto, can you make me a coffee, I got absolutely no sleep last night" she asked. "No" he said. "Excuse me?" replied Gwen. "You heard me, I said no!" "What's wrong Ianto?" said Gwen, confused, as she walked towards him. "Get away from me!" was what Gwen's polite gesture was greeted with, followed by hysterical sobbing from the receptionist. She could not figure what was up with him, so there was only thing to do – go to Jack.
Gwen walked up to Jack. "Hey Jack, What's wrong with Ianto" she asked, and the reply she received was definitely not what she expected. "PMS".