I once experienced a 4th plateau trip...at a church. As if being the only atheist there wasn't enough (don't ask), I was now severely fucked up, and let me tell you, that did not go down well. Those crazy fuckers probably thought I was possessed or some shit...and they were all my trip-sitters for the night! Being a selfish, careless bastard does have its benefits, at times.

No, I definitely wouldn't say I was looking and acting normal during that experience, but I could certainly say the same for all the sober individuals in that building. Those Pentecostals don't even need drugs to go completely out of their fucking minds - almost like a functional schizophrenia, in a sense.
In all seriousness though, don't get fucked up in public places, especially churches, unless it's one of those Native American or New Age churches where that sort of thing is encouraged. If that's the case, I say go ahead, do what you gotta do man. Now me, on the other hand? I'm done with churches, but I definitely need to get high in public more often. As always, it's hilariously fun around a supportive crowd, and a bit depressing around the anti-drug, bible pusher types. Now just one thing - why in the hell would you want to look and act normal under any circumstances? That being said, Sekio's got the dose range down perfectly. 60mg and under is about the sweet spot for "looking and acting normal," whatever the hell that means. I'd say just pick a different drug and save the DXM for a proper trip. No sense wasting it on a weak 1st or 2nd plateau dose. At that point, all you'll get is a boring, almost unnoticable robowalk and maybe some mild dizziness. Dissociation is pretty minimal in my experience at that dose range. You're better off doing some MXE if you plan on actually enjoying yourself on a low dose of something. 30mg and under has been surprisingly easy to hide, in my experience, though you're probably best staying around 20mg or so, just to avoid overdoing it.