Who has not landed on the wrong deck.....and understand we are not talking about Rigs, Large Platforms, or vessels here....but Lily Pads, Well heads, or other identical (less name) decks.
When you are doing Well Checking....hitting fields of Well Heads all with the same name but say a letter difference (Ajax-A, Ajax-B....) it can get awfully easy to do.
If you fetch up on a Semi, Jack-Up, or large production Platform by mistake....perhaps a rethink of technique/procedure/fatigue level might be in order.