I really really really really dislike it when someone tries to say that they did something that they didn't. Especially when I'm the one who actually did it.
For example, let's say you're working on a 2 person project and you decide to split it into top and bottom. Together, you work on the design and figure out the demensions and how to make the top, and then your partner makes it exactly how you both planned it to be. At the same time, both of you decide on a vague idea of how the bottom SHOULD work and look, but that's it.. You tell your partner that you can figure out the mechanics and that you will get it done and they say, "Okay, looks