Hand cleats

And I forgot about that.

And fool x3 as I deliberately delayed starting the thread until after noon. I had it ready hours ago.

Why does the tradition expire at noon?
That feature probably relates to the customary boundaries of the old renewal festivals, which limit the mayhem to a very strict timeframe. The source of Britain's deadline might be the 17th century's well-named Shig-Shag day, when celebrants put oak sprigs in their hats to show loyalty to the monarchy, in reference to Charles II's hiding in an oak tree. Those who failed to observe the custom could only be ridiculed until midday. These days, anyone who plays a prank after noon is supposedly an "April fool" themselves; this nice observation may not seem so crucial to anyone who has been custard pied at 12.01pm, but it distinguishes our version of the ritual from that found in other countries.

This is the best explanation that I could find on-line and might also explain why that's not the case in other countries.