Quote from mrbysco
i keep getting kicked out my server with a error when i place a frying pan. and when i join it is placed an can be used. just want to let you know. I will edit this and tell you what error i got
Known error, fixed in the most recent dev build.
Hmm, seems I was beaten to the arrow discussion. Something that wasn't suggested though, put string on the end of arrows to use as a rope to cross gaps or use as a ladder, etc.
Other than that, all I can think of has already been said:
Some form of infinity
Void? (Super expensive, teleports anything nearby to the moon, similar to shooting a portal from the Portal Gun mod on the moon, can only be fired once, must be destroyed by say an explosive arrow/despawn to stop the effect)
Bacon-tipped arrow- all living entities are attracted to the location this arrow lands