For me, the bougainvillea. It no longer has any blossoms below the four foot mark.
Totally worth it.
If you have any pictures of what twenty minutes of peace was worth to you today, send them! It would cheer me immensely (*this might be the start of a 3 year old support group. But I would also accept submissions for other ages, having personally witnessed the damage that six year olds, in particular, are capable of.)