After Effects Easter eggs
Hold down the shift key as you open the After Effects preferences (the "General" preferences will do), Once you see the dialog, access the drop-down menu, and a new menu named "secret" appears. The menu used to be called “schecret” in previous versions of After Effects.
Verified on AE CS3 and AE 7.0 for Mac and PC, AE 6.5 for PC
With a layer's mask properties visible, hold down ALT, SHIFT and CONTROL, then click on the words “Mask Expansion”. The property will disappear. When you bring it back, the wording is changed from “Mask Expansion” to “Mask Embiggen”. The word "Embiggen" is a neologism from The Simpsons, meaning the opposite of belittle.
Verified on AE CS3 and AE 7.0 for Mac, , AE 6.5 for PC
In the Effect Controls panel, shift-click on the area just above the top effect (where it says “compname *layername”) and you'll hear the sound of sheep. The sheep sound is also heard with some render errors, such as when you run out of disc space or are trying to write to a corrupt drive when rendering.
Verified on AE CS3, AE 7.0 and AE 6.5 for Mac, AE 6.5 for PC
Team AE 7.0 credits project
In a new project, while holding down the ALT key, click on the After Effects (Mac) or Help (PC) menu and choose “About After Effects.” Instead of seeing the standard splash screen, a file (chmb.ant, clamc.hop, or metal.oaf) loads up that displays the developer’s names, animating on. The file names are a reference to the beta code names for After Effects 6.5, 7 and CS3, respectively.
Verified on AE CS3, AE 7.0, and AE 6.5 for Mac, AE 6.5 for PC
While not exactly hidden, this is an interesting (useless?) preset included in After Effects.
The "Tone" audio effect has an animation preset called "CallAdobe" which generates Adobe's phone number (1-408-536-6000) in DTMF tones. If you put your phone up your speaker, you could indeed "Call Adobe" using this preset.
Verified on AE CS3 for Mac and AE 7.0 for Mac