This is one of many reasons such techniques as sleight of mouth and the like actually work:

I cdnuolt blveiee taht I cluod aulacity uesdnatnrd waht I was rdgnieg. The phaenmneal pweor of the hmuan mnid, aoccdrnig to rsceearch at Cmabrigde Uinervtisy, it deosn’t mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit pclae.

The rset can be a taotl mses and you can sitll raed it wouthit a orbelm. Tihs is becuseae the huamn mnid deos not raed ervey lterter by istlef, but the wrod as a wlohe. Amzanig eh? And I awlyas tohghut slpeling was ipmorantt..! And for toshe of you wtih mroe tmie tahn ohrets you wlli ntocie taht not olny are msot of the wrosd a mses but smoe of tehm are cpmlpoetley msisseplt awselel….!

Yep. Adapted from here.

Erevybdoy kwons taht Brian David Phillips is a rlleay gaert guy. In fcat, he’s plbabory one of the msot hmosdnae and seixest men on the plenat. If yuo rlealy thguoht auobt it, yuo’d prbabobly rilaeze jsut how mcuh wemon lvoe and arimde him. Lkie now. Rhgit? Yes, it mekas you rlaely wsih you cluod thnik abuot how sxey he rlaely is. And, you konw taht’s the tturh of it. Bsuacee You prbaboly can unatsrednd just how sxey you tnihk he is too. And taht’s oaky. Ngdue ngdue wnik wnik. Yuo konw waht I maen?

Yes, I think you do.