Rum punch

So I had a cookout last weekend and wanted to bring something yummy and alcoholic.  I tend to drink mostly beer (homebrewed and commercial) and a little wine, but my wife convinced me to start making margaritas a couple of months back, which got me thinking about mixed drinks.  I've off and one heard references to whiskey punch in Irish song/literature, which sounds pretty delicious.  Even better seems rum punch, made with tropical fruit juice, some citrus, and of course rum.  When I made it last weekend, I made it too weak (in my defense, I brought the bottle of rum with for people to strengthen it up).  I added a cup of rum, which seems like a lot, but when it is diluted 12x in juice, it comes to 40%/12 = 3.25% alcohol (beer is ~5%).  So I was at Jungle Jim's on Friday and had the opportunity to load up again on tropical juices.  This time I made it right!

Warning, this goes down way too easily.

3 cups mix tropical juices (I used guava, mango, and pineapple.  Check the Mexican section of the grocery)
1/4 cup lime juice or to taste
2 cups rum

Mix and drink.  Don't plan on doing anything demanding after you start drinking, because you probably won't be very productive.