In Level 7: One Bullet, go through the facility to the operating rooms with Xeno specimens in 
glass containers. Continue past a room where test subjects are attached to Facehuggers and 
through the hallway ahead where you encounter more soldiers. In this area, look for a door with
a green light. Explore the hallway to locate an office with the mission's second audio log. 
Before entering the second room where soldiers attempt to activate alarms, leave, and go around
to another hallway leading to the same alarm room. Cruz will wait to rush inside the alarm room.
Instead of following him, leave the operating room through the alternate door, and enter the 
alarm room through the left side of the path. By entering the alarm room this alternate way, it
will activate a special Easter Egg. Inside one of the glass containers, look closely to see a 
tiny top hat and cane where a chestburster should be. This is a reference to the famous scene 
near the end of Spaceballs, when the character Kane (played by John Hurt) makes a cameo, in which
a chestburster explodes from his chest and dances out of the scene singing "Hello! Ma Baby" — 
which is a reference to the Warner Bros. character Michigan J. Frog.