One time I went to my Jiu-Jitsu dojo wearing wooden Japanese sandals and this guy asked me about them, said he wanted a pair. The next time I went to São Paulo, I bought them for him and brought them back. He looked at me suspiciously and said "How much?", running his thumb against two fingers. I thought about it for a minute and ended up saying, "Ehhhh...you can just have them. Present from me."
"Really?!?!" he said, eyes lit up like holiday bulbs.
"Yeah," I said shrugging, but inside feeling ecstatic to have made the right choice to gift them.
"Woooooo!!!" he squealed. He then pursed his lips and began rubbing the sandals against the two sides of his face.
The next week he came to the dojo with his wife, introducing as "the guy that gave me the sandals." His wife bowed slightly and thanked me, saying that he gets so happy when he sees them and periodically rubs them against his face.
That experience was definitely worth eight dollars.