Clocks
I just realized that the 4 on an analog clock is also the 20th minute. 4:20.
4:20 PM v. AM
smoking at 4:20 PM means yea, you like to smoke. smoking at 4:20 AM, now thats dedication
Holy Bong Water
I just used Holy Water that my friend stole from a church as my bong water.
Brilliant Idea
make a double ended toothpaste bottle. that way, when it is at the end you can just open the other end and get all of it. genius, if i do say so myself