One time I was so thirsty, I drank two cans of Monster energy (a liter). I usually don't use caffeine, no coffe, no energy drinks. It was cold it felt good in summer on a train.
I didn't realize what I did, untill 15 minutes passed. I wouldn't call it a "high" but my mindstate was different. I just noticed things that I usuallly don't. I heard the sound of a clock, and every little noise around me. My hearing was different, I don't know if you play any GTAV, but I'd compare it to Michael's time slowing special ability. Like I had more time the check out my environment than I do usually. I became a lil' bit paranoid, but my buddy were with me, he helped me to chill out.
I wouldn't call it a pleasent memory (not a horrible one neither), it just doesn't worth the extra work your heart has to do.