Pepsi tastes like what I imagine dish detergent would taste like...or, something I do know, ivory soap, my Mom scubbed my tongue on more than one occasion.
I've heard that before. Back in the days of glass "Return for Deposit" bottles, I recall my dad saying that Pepsi tasted similar to Coke, except that when they washed the bottles for re-use they forgot to rinse out the soap residue.