I’m pigeon-toed, so I can bend my legs around in ways that make most people cringe. Remember that exercise from gym class called the butterfly? I can pull my feet all the way in and sit on top of them.
This thread reminds me of a party trick my friend Byron used to do: he could turn his arm around 360 degrees. That was pretty gross. Then there was my old friend Paul… he could make the veins under his knuckles move. Very creepy when I had my hand on top of his… 
As for me, I’m not sure I can do mundane pointless stuff such as this. Does blurting out phone numbers, birthdays, and such on command count?
F_X
[hijack] i keep running across the number 666; see below:[/hijack]
interface2x
Member
Registered: Mar 2001
Location: Westmont, IL
Posts: 666
Flamsterette_X
Member
Registered: Mar 2002
Location: Richmond, BC, Canada
Posts: 2666
I can wiggle my nose like a rabbit.
I can and frequently do make an improvised horn out of any(clean) tubing available. This was especially interesting a few weeks ago in Wal-Mart when a friend and myself stuck together enough plastic candycane lawn ornaments to enable me to play some tunes(albeit poorly tuned) in their upper regester. This thing was over thirty feet long and looked like a contraption from a Seuss book.
Mundane, pointless things I can do (but are good party tricks and good for showing off :D):
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the splits, two ways.
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walk on my hands. (Mostly pointless although it is handy if you have a sore foot.)
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flips (Though these are handy if I need to demo something for the kids I coach.)
:::::Omnious Gong::::
I *challenge * you to fart that song!
THPHTHPTHSuiTHPHTSide iSTHHPHHHHT pain(ungh)leSSTHHTTRRRRTHPT
(grunt)youfffft go THRRRRPPPHTHrough (nnnrrrr)manGGWWRTy CHHHHHTHPPHTCHangeSSSSSffft
Man, this is tougher than I remember!
I can make a very irritating snappin’ cartilage sound with my shoulder. My mom can’t bear to hear it.
I can also swallow almost any sort of pill without water, the exception being the home-made type herbal gelcaps.
I can raise my right eyebrow like Spock.
And, get this. I can see the 3-D image in those magic eye puzzles.
I can clap each hand individually, oftentimes to an established rhythm.
What is the sound of one hand clapping?
CL, of course.
The other hand produces the AP.
[sub]With apologies to Terry Pratchett[/sub]
Like MacDairmuid, I can cock one eyebrow, only mine’s the left. It’s great for silent commentary.
I am double-jointed in the top joint of my left index finger. This has absolutely no applied use or interest at all.
Given a little mental adjustment time, I can “look through” things and not notice them, e.g. I keep the protective plastic overlay from Dell over my new flat screen monitor to protect it from smoke and dust. I haven’t found a perfectly clear alternative yet but don’t even notice the printed lines/numbers on the plastic over the screen anymore. I just don’t notice 'em.
Actually I’m revoltingly usual.
Veb
I can run on all fours-quite fast, and can turn and reverse with remarkable agility. I contact the floor with my knuckles and knees, and alternate limbs like a running dog. I tried galloping, but that puts so much stress on the knees… This has to be seen to be believed, and it rarely fails to impress for one reason or another.
I forgot to add one…
Given a fairly large pen for grippability, I can write fairly clearly with my the pen clutched between the toes of my right foot, though not my left.
This ability was discovered during a slightly (okay, very) beer-intensive late night session at grad school.
Oddly enough, a useful application hasn’t presented itself yet.
Veb