If he meant it then Chamberlain's was probably the best - goal out of nothing from a completely unconventional shooting position. There has to be a fair element of doubt as to whether it was a fluke though.
On the basis that Chambo's was a fluke, Lambert away to MK Dons has to be the best. To control a goalkick, turn and hit it into the opposite goal instantly takes skill, poise, vision and technique. Again, a goal out of nothing. Thomas' is without doubt the funniest for some reason. Honorable mentions to Schneiderlin (one goal FFS), Lallana and Barnard.