The Chang Scale is a universal measurement of how high a person is.
The scale is organized as follows:
0 - Sober
1 - Semi
2 - Subdued
3 - Stoned
4 - Stupid
5 - Surreal
Hope: Dude, I'm so high
Johnna: Wait, how high?
Hope: I'd say on the Chang Scale, I'm about a 3.5
Johnna: Nice!