Ah, the old Turbo Button.  
A friend had a brand new 386-33 he was showing off to me.  Thing was a dog compared to my 386-SX16 though so I checked, and sure enough the turbo button was pushed in.  So I reach over, set it to Turbo and Josh about comes unglued.  "No, don't do that!  I don't want it to wear out!"