bait_and_switch
When an image appears to be one thing, but is actually another. Or, when the outcome of a situation is the opposite of what you expect. Often, this is a situation that appears to be sexual, but is actually totally innocent.
If it's a pool, tag this at the page of switch only.
See also
* good end
* come under the blanket (meme)
* expectation vs. reality
* pool #1229 (Misleading Thumbnails)
* pool #5019 (Unexpectedly Good)
Aliases: none