1. Those seemingly eternal moments after you've concluded a one-on-one side conversation with someone at a dinner/party and the two of you are trying to fold yourselves back into the main conversation are the absolute worst. You're both silent, avoiding eye contact with one another, listening intently to your companions' conversation to try and figure out what they're talking about so you can work yourselves back in.
2. The more emphatically your friend expresses her enthusiasm at the beginning of the evening about spending the night out with you ("I seriously am so excited that we're hanging out right now," "After this week, I am so ready to get wasted tonight"), the more likely she will apologize profusely at like 10pm that she is just so tired and needs to check in early and it was so good to see you and she wishes she wasn't feeling so out of it.
3. One of your good friends is telling a story at a party to a small audience about something that happened to the two of you, and you notice that she is altering the details of the story in a minor, but notable, way. She's exaggerating the harrowing circumstances, making the funny parts funnier, leaving out a few key context-setting facts. You wonder how she would tell the story if you weren't there.