Some of the most uncomfortable situations are experience in elevators.
#1 - Standing there awkwardly when its just you and someone that you don't know. You look everywhere in the elevator, or pick one spot, and pretend to actually be interested in it. Whatever it takes to avoid eyecontact with the other person. Hopefully it isn't a long elevator ride. And heaven forbid they should try to talk to you...
#2 - "So where are you from?" Dang it. "Utah," you say, breaking your eyecontact with the wall, but not actually looking at the other person. "Oh.. Utah." "Yep." Awkward silence. "I'm from California." "Oh, that's cool." Cue another awkward silence.
#3 - Many people in an elevator can be awkward too. A handful of strangers in a 50-square-foot space all trying not to look at eachother or talk to eachother. Do you crack a joke to ease the tension? Who knows.
#4 - Getting off on the wrong floor, then realizing it's the wrong floor, doubling back to get back in the elevator, and the metal door to closes on you... and you scream. Chances are, there was someone in the elevator to see that embarrassing moment.
Elevators don't have to be awkward, I guess. They are good for some things. Like handstands. When it's just you and your sister, try it out. It's much harder than you might think.
Also, they have a lot of potential to house a romantic encounter.
Color my life with the chaos of trouble.