This has probably been reported somewhere... but try pressing several of the numerical keys on your keyboard at the same time (above the QWERTY keyboard, and/or the numerical keyboard). Many of you will be unable to activate all 10 keys at the same time. The result will differ based on how your keyboard is wired (thanks @colinmacc for helping me figure this out). This would similarly be the case with other keys. This is not a bug in Scratch, but good to be aware of nonetheless. Try it yourself and comment.
