Well like lying to someone about a surpise party?
Le unweary friend: What are we gonna do when we get to your home?
Le me: I don't known, chilli'n out on the PS3 or something, nothing much.
Le unweary friend: Allright.
SURPRISE!
Take 2.
Le unweary friend: What are we gonna do when we get to your home?
Le me: I've organised a surprise party for your return home mate!
Le weary friend: Cool bro, but you could've surprised me real good if you hadn't told me...
Le me: Yeah but lying is bad so I was told
FAILED SURPRISE