No, not the fat and tall motherforgeters, just this guy:

Got it today from Home Depot, it's known as the "Red-Headed Irishman." Maybe they're from Ireland...? I don't know. Does anyone here have experience with cacti? I got the basics: pot, sunlight, bug spray, that stuff. The people at Home Depot told me that I should water it every 4-5 weeks. That is true for most cacti, but... I'm not sure about this one, many people beg to differ, so I just want to hear what you have to say.
btw, it's name is Curly :)