I spoke too soon- Wrinkly toes

I knew that having everyone happy at the pool was just too good to last, and it was.  Liam is back to not wanting to go in the pool.  Took him today and he refused to go anywhere near the water.  I was so confused.  What happened?!?  He didn't want to get out the last time?  After a half an hour of unsuccessful attempts to get him to come in, he finally yelled that he didn't want his toes to get wrinkly.  Seriously.  We stayed in the pool so long the last visit that his toes were wrinkly and I had noticed him trying to rub the wrinkles away.  I had no idea it bothered him that much.  He's back to camping out at the sandbox again.  SMH!