I saw this snail climbing around on top of my Euphorbia horrida.
Of course, snails can climb over broken glass and even razor blades without hurting themselves, so what's a few thorns? Except when he got far enough up on that dead leaf, his weight pushed the leaf, with him on it, over the edge and onto the ground. Just a few inches down. No harm done.
This pale little snail nearby was showing off his cactus-scaling talents. He went right up to the top of the flower bud.
OK, very nice. But I don't want you to eat my cactus flowers. Back into the ivy you go!