When the passengers of a car misjudge the speed of the vehicle because they are viewing the analog speedometer at an angle. When not viewed straight on, the needle appears to indicate higher or lower speeds than the vehicle is actually travelling.
Jen: Slow down or the cops are going to arrest you.
Bob: I'm going the speed limit...
Jen: It looks like you're going 5 over from the passenger seat.
Bob: That's the spedical illusion messing with you.
Spedicle commonly mistaken for the term sped, is an unintelligent dumb ass who believes everyone maintains a friendship with them when everyone actually believes they are a gay/lesbianprostitute and takes pleasure in laughing at them behind their back.
Lili you spedicle, you can't just ask to feel someone's muscles.