The penny stack is an amusement for people of all ages, get a load of pennies (or two p's whatever your choice) and get some some super glue.
Next stick one down on somewhere people will see it, and wait until dry. And then add another. Keep going until you feel satisfied.
Now someone will be very perplexed by the stacked up pennies. =]
Did you see that awesome 1000 high penny stack?
Yeah dude, it was sick.