well there are 2 reasons why i skip gears...
1) when i'm dropping the clutch and burning out i go from 1st to 3rd because i've seen way too many people lose 2nd gear doing a burnout and shifting into 2nd when the revs are too high.
2) when my girlfriend is in my car, occasionally for some odd reason i have to go from 1st to 4th...you could imagine why