it looks kinda weird since he's just standing there while the floor disappears... I understand you're going for the cartoony thing where someone walks off a cliff and continues walking until they realize where they are and fall, but still, there should be some kind of reaction on his part.  Maybe he could raise his arms as he falls?  

Also, do you have any ideas for the walls? Cause that would add so much to this, it could tell the story of where he is... and why the floor is falling lol.

Well, that's it for now, can't wait for an update

In my opinion, one of the most important things about an animation is its flow throughout. It looks odd when a person magically appears, or the floor just shows up again.

And, to make it more interesting, have a giant crevasse work its way across the floor. Also, have some increase in speed as he falls. Or, like someone suggested, make it the cartoony dust-poof.

Make the walls crack or something, they're too blank at the moment.

And, just curious, what program did you use to make this?

very nice, imho

but you should fix the appear of the man....

why don't you make him enter from the door an than fall into the trap?

Nice idea, but must open and close door when hi is enter.

Your animation will be with very much frames and I think file will be with very big size ..., but try to make some light parts in corners of hole, furniture, pictures and floor because now for me they are very dark ...

animation of open and close hole isn't good maybe need delay and accelerate in some frames as vision :)

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:) GDGB :)

That's really great dude. 

No specific file size yet (the animation has to justify large file size).  You've got nothing to worry about... you're only at 9KB right now and the cool animation makes double that definitely worthwhile.

Just some words:

... for 2-nd frame add one frame more for open door ... and for closing door too ...

... his left leg isn't good when he walk ...

... you use 16 px in left and 8 down for only one frame when he move in the room ... I suggest to make them 2or4 in left ... yes frames will be more but motion will be lightly

... for stand up and sit ... purple man need one frame more ... and when open hole his arm must have motion

... for open the hole need maybe 2 frames more ...

now you have 19 frames ... for good animation I think must be near to 60-80, but I sugget you to finish with all furniture and than make animation

... hm if you add shadows will be very good and interesting :)

for me tree is very cartoon and his plant pot is very big ... desk is very empty ... you can add more details on the floor ...

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:) GDGB :)

The theory goes that you are what you eat. I can't exactly eat my computer, so if I did the robot dance long enough, would I become computerlike so I could read barcodes?

Theansweris42. Wait, what?

Alright, back on topic. I think the barcodes work well as a language, though strategic placement of punctuation would do well in terms of showing us why the guy deserved to get dropped down a pit. Like, maybe an exclamation mark, or elipses (...). Or you could do the internet's favorite thing and add a few random characters, like so: 8I

stoopid emoticons...

the sitting guys upper legs disappear when he ''stands up''

hmm.. they don't disappear, they shrink *nod* his torso eats up the thighs and attaches itself to the knees.  I didn't even notice it though, until you mentioned it.