ON world 2-2 or 2-3, (not sure), when lakitu is throwing spikes get up on to a high position and make sure you're the mario who fires fireballs jump up above him and keep firing if you hit him he will dies but his cloud will be still there jump up into it and you can ride around in it for a while! NOTE THE CLOUD DOESN'T LAST FOREVER AFTER A WHILE IT'LL GO AWAY.