Not really hacking, but every time I work from home(a couple times a week), in lieu of using my company's VPN, I connect to the company network with an SSH reverse tunnel. To make this possible, I wrote a port knocker that runs in a tmux session on a server inside the network. It tries to connect to a high-numbered port on my home machine, and if successful it opens the reverse tunnel. At home, I manually run a script that opens that port and informs me when the reverse tunnel is established.

Then I open an SSH socks5 proxy and use that in my Firefox dev edition, which I use entirely for work.

This is actually much easier than using the actual VPN.