I was at an open zoo in south Thailand about 8 years ago and they had an open field with elephants and zebras roaming together.

A zebra walked past the elephant and the elephant whacked the zebra on the butt with his trunk. The zebra got a fight and jumped and ran off, which prompted the elephant to throw his trunk in air, throw his head back, and make a noise.

I’ve always thought that was the elephant laughing at scaring the zebra.