An Oxford Surprise is when a door is opened in front of you and the person behind it squirts a load of their semen into your eye.
Obviously, this takes a lot of planning and accuracy.

The Oxford reference is because that is where it was conceived.
"Oy, where's Jack?"
"Jack's in the bathroom"
"Why?"
*Big grin*
"Oxford Surprise!"
by Monty MacGuffin December 15, 2007
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