Ronaldthecock produced this Black Mesa/Michigan J Frog mashup as part of a machinima challenge on steamcommunity.com:
Let's have another Theme week. Starting sunday September 16th and running through sunday September 23rd, will be Critter week. in honor of the release of Black Mesa this friday, Make Videos of headcrabs, bullsquids, antlions, alien swarm monsters, or whatever creepy crawly you want. Put "OSFM critter week" in the Video description and post it here. There are a couple people working on rigs to make animating monsters like headcrabs easier, so keep an eye out and I'll post them here.