Digging up an old thread, but it's relevant. I smoked spice last night and mid-trip my cat jumped on the couch, all purring and whatnot. I started peaking and heard this whistling noise. I looked over and the cat was sniffing the pipe (it's one of those bulb/meth pipes) at the hole above the bulb. This is the second time she has done this. She got in my lap and started getting all affectionate. All I could do was giggle. I had this unshakeable feeling that she sensed something familiar in the pipe.