Bowser Time is a new kind of event in Mario Party 7. This event happens every five turns, and this only appears on Party Cruise mode. After every turn, a gauge shaped like Bowser's face fills up; when it's completely full, Bowser comes and creates chaos for the players. There are many things Bowser can do, depending on the board.
Bowser will take a photograph of the players, then make them pay 10 or 20 coins for it. Sometimes, he'll "stumble into" the photo, but this has no effect on the cost at all. After making everyone pay their coins, Bowser will leave without giving anyone the picture, which Toadsworth points out.
Bowser will crush one of the Orb Shops and make it his own, entitled "Bowser City". The first person to pass by Bowser's shop will be forced into buying a useless item for 20 coins, which could either be a Golden Bowser Statue or a Koopa Kid Orb. After paying for the item, Koopa Kid will come and steal it from them, and the shop will disappear.
Will crush one of the windmills (always one that has been bought already). After this, a new windmill was built with no coins, thus no owner.
Will make Koopa Kid steal a random amount of coins from a random windmill. Sometimes, a Koopa Shepherdess would walk by, making Koopa Kid disguise himself as a bush. It is unknown if this effects the cost or not.