Test

"So this is a test," said Twilight Sparkle. "'Test' as in 'testicle'."

And so it was. It was a test the likes of which mortal eyes had never seen before (and immortal eyes probably neither, so "[...] the likes of which had never been seen before" would be more accurate, but less aesthetically pleasing), a test to out-test all test. So testy was it that Twilight could feel a pleasant tickle running down her spine as she stared at it. Her tail flicked nervously, her pupils dilated, her heart beat faster and faster, and next thing she knew she had the test in her mouth, sucking on it like mad.