Before I was born my parents lovingly decorated my nursery with wacky 60's wallpaper, seeing as it was the 60's at the time. Amongst the cuddly cute toys was a black kitten playing with a ball of wool. Darn cute you might say.
Unfortunately I started hallucinating black cats that slowly grew in size, detail and the ability to menace me, until they were towering over my cot with their evil green eyes. Often they would begin by just showing me their ears before raising themselves up over my ickle baby body.
And so, I would then scream like a baby can until my exhausted parents came in to make them vanish with their god-like power. Poor old parents were at the wits end until I learned to speak, at which point they ripped down the offending wall paper and gave me some soldiers, as my brother was about to be born. That probably explains why I turned out gay too.
And so we all lived happily ever after and I joined the army when i got older to kill evil black cats everywhere. Incidentally I now have a devoted little black cat called Shadow, who guards me loyally every night, so there you are. His eyes are yellow.

Tell me, does you classroom have a projector?

There is no completely safe way to do most things in life, from driving a car to climbing a mountain to swimming in the sea, which is not a reason why not to do it. Informed and responsible use of 5-HT psychedelics and salvia involves truly minimal risk, I find it more dangerous getting drunk on a night out than smoking salvia or eating 300 morning glory seeds. I have been doing so occasionally for the last 4 years and never regretted it once, and am now near finishing college, not some loser stoner dropout . There is absolutely no scientific proof that the said substances are in any way damaging to the health, nor are they addictive.

Also, for the sake of this forum and for the record, don't break the law. There are few, but good, ways to experience these things completely legally for anyone who wants to. The most important thing is information. Read and read and read about these things, or don't try them at all. Most people who do stupid things do so because they are ill informed, their stupidity gets in the media and they ruin it for the rest of us. Drinking 2-3 pints of beer won't kill you. Drinking a bottle of vodka might.

Another way you can distort your vision and make you "hallucinate" is by watching videos with optical illusions like http://www.youtube.com/watch?v=vzSRVgF501M. It's very simple, and probably the safest way to do it since you don't deprive your body of anything, and it only lasts a minute or so. It's also probably the weakest sort of hallucination you can induce. It's pretty interesting though, in my opinion. It's fun watching your room as it waves and distorts around you.