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Easter egg: @UseClear’s response when you use their app late in your day/evening. See the older post for other implementations for this idea.
Via dabboj.

Easter egg: @UseClear’s response when you use their app late in your day/evening. See the older post for other implementations for this idea.

Via dabboj.

Surprise your users: when you’re in Photojojo’s (@photojojo) checkout process, you’ll be greeted by a little robot when you input your name. Creates a personal touch. 
Via Zurb. 

Surprise your users: when you’re in Photojojo’s (@photojojo) checkout process, you’ll be greeted by a little robot when you input your name. Creates a personal touch. 

Via Zurb

Surprise your users: BestVendor (@bestvendor) uses a dog image (surely part of some meme out there) to baffle the users right before sign up. It’s a simple way to inject some humor into an app (you might try to target a certain fanbase like Dropbox’s Drew Houston did so skillfully here) .

Surprise your users: BestVendor (@bestvendor) uses a dog image (surely part of some meme out there) to baffle the users right before sign up. It’s a simple way to inject some humor into an app (you might try to target a certain fanbase like Dropbox’s Drew Houston did so skillfully here) .

Surprise your users: In Mailchimp’s (@mailchimp) email preview you will rip the chimp’s arm off if you resize the window too much.

Via Zurb.

Surprise your users: Gidsy (@gidsynews) displays a little rainbow pointer in the footer when you hover over “Create a listing for free” (pointing at the Learn more section).
Surprises/details like this will result in a memorable user experience and sharing.

Surprise your users: Gidsy (@gidsynews) displays a little rainbow pointer in the footer when you hover over “Create a listing for free” (pointing at the Learn more section).

Surprises/details like this will result in a memorable user experience and sharing.

Surprise: Automattic’s Jetpack (@jetpack) site has a little animated surprise when you load the page. 

Check out Automattic’s fine humor and love of detail.