'Arthur Dent' Moments (n.)
Occasions when you are confronted with trying to understand those immediately around you (whether acquaintances or otherwise), but are unable to do so. Whether your incomprehension is due to your own lack of concentration, or the amount of alcohol consumed by members of the party, or other reasons, is irrelevant. However, you are left with the feeling(s) of a) complete bewilderment, and b) the overwhelming need for a cup of tea.
Usage: "I just didn't know what was going on, or what I was supposed to do. It was a real 'Arthur Dent' moment."