What does 'Clear Origin' (AltO) do? Someone mentioned it on our general chat.
AltO is ambiguous as it performs a different action depending on which view area you are in. In the 3d view, you can use it to clear the object origin, in the text editor, use it to open a text block, in the sequencer it clears strip offsets etc.
To see the full list, search by Key-Binding for Alt O under Input in user preferences.