Time may pass without you noticing it. It is even possible to sleep whilst on mushrooms. Side effects include nausea during the early stages, and loss of co-ordination. Some depression and frustration with everyday life may occur in the days following the mushroom trip. This is believed to be purely psychological.
Some people like to dance whilst on mushrooms, but many like to lie down.
Your response may vary. Take mushrooms on an empty stomach. Drink lots of water - the body may to want to flush itself with water during the mushroom trip. Make sure that you have warm clothes as cold can be unpleasant. Do not go out and pick and eat wild mushrooms unless you know exactly what you are doing.