The raise amount should be the same no matter what you hold, right? Otherwise you'd be giving your opponents some information.

But what if you raise a random amount between 3x and 5x the blind every time? Now you can raise higher with better cards on AVERAGE but your opponents won't know it. Say for every ten times you have a pair of aces you:

raise 5x two times
raise 4x three times
raise 3x two times
check three times

now every ten times you have a pair of queens you:
raise 5x four times
raise 4x three times
raise 3x two times
check once (to mix it up)

and you can use your watch to determine the amount (using the second hand)
and even if someone KNOWS you're using the watch, they don't know what you have since the raise amount could be with any hand, but just more likely with one of your hands

this is what dan harrington suggests

this way you can be unpredictable, but bet the "correct" amount on average

by correct I mean theoretically correct if your opponents wouldn't use this information