Noises make Trevy belly laugh.
Especially body noises.
So if you're feeling extra "airy in the derry" (yes, that's original with me!) when we're hanging out...you'd better hope it's not loud.
Otherwise he'll blow raspberries to mimic the sound and belly laugh til' you're tomato red face gives you away!
Which reminds me. I was so happy he was with Grams when I was errand running last week. Cause that poor sap who let it rip while I was passing by would have been toast!