Hmmmm... I will have to test this...
The lofty fox left down London road.
THE LOFTY FOX LEFT DOWN LONDON ROAD.
The lofty fox left down London road.
The Lofty Fox Left Down London Road.
the lofty fox left down london road.
Th3 lofty fox l3ft down London ro@d.
The lofty fox left down London road.
The lofty fox left down London road.
(These next ones are quite fun to read.

)
The lotfy fxo letf dwon Lodnon raod.
eht ytfol xof nwod nodnol daor.
Vjg nqhva hqz nghv fqyp Nqpfqp tqcf.
20.8.5. 12.15.6.20.25 6.15.24. 12.5.6.20 4.15.23 12.15.14.6.15.14 18.15.1.6.
The lofty fox left down London road. (Did you see me?)
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To be honest, I find it rather enjoyable to read text like this.
Since it adds some personality to the text.
(Unless the poster is trying to be rude.)
Hmmm... though the number code should have probably started at 0, rather than 1.
*shrugs*