[PantsOnFire]

Limping early with a premium hand is a legitimate play at a loose-agressive table if your intention is to expect a raise behind you and then come over the top. This is especially true if you alternate and raise early with premium hands as well. Further, a play like this might allow you in the future to limp early with something like QJs or 88 and not get raised behind if the opponents have been paying attention.

Another legit limp is in SB and it is folded to you. You are essentially starting a trap right at preflop.

Of course, you need to mix up your play and not do this with every premium hand you get (or even most of them for that matter).

I even remember reading a Daniel Negranau article where he says that limping once and awhile with AA will make you harder to read.