how to make a stationary wave?

surely it cant be that hard, theres a few bits of plastic and a water pump lying round here somewhere..........
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CheeZee wrote:..ahh my childhood comes back one more time today !! ...
" fill your bath but only half way , jump on in .. grab the sides whilst keeping a low body profile ..then slide smoothly forward and backwards keeping in time with the building wave going backwards and forwards .. then stop and lay low ... "overheader on its way " ..soaks the hell out of your bathroom but good fun all the same