Half-Life 2 Easter Egg - Oh Lazlo, we hardly knew ye.

During Chapter 8, Sandtraps, right after the fight in the lighthouse, you'll continue past a loading screen. Just after this, you'll talk to two rebels who say "Don't go on the sand, the antlions are going crazy!" Normally, one of the rebels moves and both are killed by the antlions. However, if you can kill all the antlions before they both die, you'll hear a special speech. "Lazlo! The greatest mind of his generation..." and so on. Pretty cool little egg. Tip: I used the sk_plr_num_shotgun_pellets # cheat to help kill the antlions quickly. Try replacing # with 400-500.