I plugged an MDA tab a few days ago and laid down with my MP3 player and headphones; I got through 2 6-7minute tracks, and by the time the third hit, I already had the stupid tell-tale face on :D
Later that evening, I plugged 1.5 tabs (1 MDMA, .5 MDA) and my friends tell me that I was floored like someone hit me with a sledgehammer within like 8-9 minutes. Good times :D