Col. O'Neill in “Unfinished Business”

[Cut to interior of a Goa'uld ship. The ring device activates, then deactivates with no-one apparently having beamed aboard. The Jaffa on-board look puzzled. Suddenly, each of them gets his ass kicked in turn by an invisible opponent. The rings activate again, and the rest of the team beam up. They look around, confused.]

Hello? Hand signals? I'm waving you over!