Ok, keeping the terms short and catchy, then..

We have the "battlefield" upgrade. This one is well-known. After you've boarded the plane, stashed your stuff in the coach seat,and have to swim upstream to take your new seat.

We have the "beeper" upgrade (suggested by Enhanced in Austin), where you get to hold up the line while the machine beeps funny to tell you the coach boarding pass is invalid.

We have the "bluerug" upgrade. This is the kind where you get the battlefield upgrade a few minutes earlier, while still in the boarding lounge, and hence you still get to walk on the blue rug. (I know you're eligible to walk on the rug when you're in coach anyway, but I dunno, I just feel cheap doing that--like I'm breaking Gordon's trust or something).

We have the "beer-drinking" upgrade (thanks to IAH_FLYER) where you get it while indulging in an airport waiting activity such as drinking a beer in the PC (or my personal favorite--drinking a beer while giving people the evil stare from the balcony at Pappadeaux's in IAH-E)

We have the "Random act of Kindness" upgrade, as described by Channa, when odd circumstances free up seats at the last minute.

And we of course have the "Gordon's Happiest" upgrade, when you are forced to pay full Y and they upgrade you after booking. On the rare occasions I get this one I just about roll around on the blue rug.

(I suppose there could also be a "Siegel" upgrade where you don't get upgraded becasue they switched the flight to a COEX RJ.)

...admit it,this is more fun than kvetching about 50%eqm for the umpteenth time...