1. IN A NOISE MAKER FOR USE WITH A VEHICLE COMPRISING A FRAME AND A GROUND TRACTION WHEEL ROTATABLY MOUNTED THEREON, THE COMBINATION COMPRISING POWER PICKUP MEANS, MEANS TO RELEASABLY CLAMP SAID POWER PICKUP MEANS ON SAID VEHICLE ADJACENT THE PERIPHERY OF SAID WHEEL, SAID POWER PICKUP MEANS HAVING A ROTARY PORTION ADAPTED TO DRIVINGLY ENGAGE SAID PERIPHERY OF SAID WHEEL, MEANS URGING SAID PORTION INTO DRIVING ENGAGEMENT WITH THE PERIPHERY OF SAID WHEEL, A CASING, MEANS TO REMOVABLY MOUNT SAID CASING ON A PORTION OF SAID FRAME SPACED FROM SAID WHEEL, NOISE MAKING MEANS, MEANS TO MOUNT SAID NOISE MAKING MEANS WITHIN SAID CASING, FLEXIBLE POWER TRANSMISSION MEANS CONNECTED TO SAID ROTARY PORTION OF SAID POWER PICKUP MEANS, MEANS CONTROLLED BY SAID POWER TRANSMISSION MEANS TO ARCUATE SAID NOISE MAKING MEANS, AND MEANS TO RENDER SAID NOISE MAKING MEANS INOPERATIVE TO MAKE NOISE WHILE SAID POWER PICKUP MEANS PICKS UP POWER.