Scratch

Yes it will! This project will actually close after 10 seconds. 
Here it is 
That is a direct download link. To view the project, click here.
It only works offline.

HOW IT WORKS:
The script:
[blocks]<when green flag clicked>
<reset timer>
<wait( 7 )secs>
<set{ var }to( 2
<repeat( <{ var }>
       <set{ var }to( (( <{ var }> <*> <{ var }> ))
       <repeat( <{ var }>
           <set{ var }to( (( <{ var }> <*> <{ var }> ))
       <end>
<end>[/blocks]

Explanation:
Wait 7 secs is because it actually takes 3 seconds to operate.
Then, it sets the variable to 2, then twice, var squared. In each is squaring var var times. That comes out to infinity. Then, Scratch crashes because it cannot compute that high. It closes.






EDIT: I made a remix that doesn't show as a remix.    It uses the same script, except a when <> is true block    at the top. Here is the project: This project will self destruct in 10 seconds (approx.) (Download) [1]  To simply view the project, click here. 

Here is the new script:

when <<[1]=[1]> and <(var)<[2]>> is true
change [var] by (1)
reset timer
wait (7) secs
set [var] to [2]
repeat (var)
   set [var] to ((var)*(var))
  repeat (var)
     set [var] to ((var)*(var))

About that hacked hat block, in his project notes Pecola1 wrote:

The when hat block will only work if your scripts pane is set to the sprite which has the block.

The when hat block will not work if you are in presentation mode.

This block will not work online if you upload it.

This block will be obsolete in Experimental viewer.

If someone uses this block in a project and you download the project they made it in, the block will work!

Last edited by scimonster (2011-02-16 14:36:43)