so what do you do when your kids want to irritate each other?

Summer is really starting to get to my kids.  And me, if the truth be told.  I think its time to start a new list of summer boredom busters.

1.  Playdoh
2.  water play (kitchen sink)
3.  finger paint
4.  mega lego building
5.  playground time
6.  puzzles
7.  read a book
8.  crafts
9.  towel skiing (aka mop the kitchen floor)!
10.  build a tent

I need some new ideas.  there are only so many times you can use these ideas in a row, without someone getting bored.  What kinds of things do you do to keep your kids from purposely irritating each other?