Does not really piss me off, but we do not have a "What is slightly annoying to you and things you find inconsiderate" thread;
Photos embedded within a post. Not the post that contain the original photos placed within a post, but the rookies who when hitting the "reply with quote" button don't have the skill to delete the 8 high resolution, slow as ass to load, photos that 4 other forum members before them also did not take the time to eliminate from their post too. Just provide the text, or the one photo, you may have a specific question about! All we need is the summary of your comment and/or question, not a repeating slide show of the same photos on every page of a 19 page thread. In closing, do more gooder at your interweb skillz......