You will not, in a crowded restaurant, where the 2-top tables are about 2 inches apart, decide that this is your night to sit side by side, as opposed to across from one another, as a normal, considerate person would. So obnoxious.
At one point one of the perpetrators turned to me and apologized for the fact that her purse was practically on my lap. I wanted to say, "Oh it's no problem, but I'd like to not have your boyfriend's arm draped around my shoulder every time I lean back. Thanks."