Honestly? One ex-girlfriend's access port when I found out I could unfortunately fit at the very least one normal-sized physical human foot into...
Talk about a depressing experience! (Yes I know this will probably get this post pulled, but you mates out there who have experienced likely the same thing will know how saddening such an occurrence will likely have brought about then as a result. :J )
Or having a bad case of whiskey D after a long night of drinking. Like shooting pool with a rope.