What is that?

So, the other day Coby says:
"Babe, do you know what this stuff is on the floor of the garage?"
I said:
"Nope..." "Boys, does anyone know what this is, did someone spill something in here?"
(I really didn't expect a logical or honest response from 2, 4, and 5 year olds...)
But, Quint shrugged up his shoulders and with a no nonsense tone he said:
"Yeah, I peed on the tire..."

(Duh...)


Preface:
Yes, I have had my boys pee on the tire in a parking lot, on occasion, after I had packed all 4 young kids back into the car from being in the store too long, and then one says, "I have to pee!"

So, of course, I was laughing hysterically, and Coby looked on confused and disgusted.